Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b51ff362eaf58b9…

MALICIOUS

PDF

50.8 KB Created: 2020-10-26 14:56:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 82f030fc915a92c6c33c1489c2eb441a SHA-1: 7ee752fe38d2b4dd7ec77555a06ff5a170212ac0 SHA-256: 1b51ff362eaf58b93dffb2e813548d8963d87319cf1898dd66f7c07f1b039b37
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to malicious redirector infrastructure, specifically pointing to 'https://cctraff.ru/aws?keyword=%25C4%2591%25E1%25BB%2595i+file+pdf+sang+word'. Additionally, it exhibits a PDF SEO link farm behavior with numerous external PDF links, including one to 'https://uploads.strikinglycdn.com/files/5c5665e5-2a41-47a6-bc21-14dcb361857d/.pdf'. The presence of a 'download button' lure further supports a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/aws?keyword=%25C4%2591%25E1%25BB%2595i+file+pdf+sang+word In PDF document text
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/3117058.pdfIn PDF document text
    • https://gumomamomav.weebly.com/uploads/1/3/1/3/131398069/351def06.pdfIn PDF document text
    • https://nivozigagu.weebly.com/uploads/1/3/4/4/134439663/zofajemunoset.pdfIn PDF document text
    • https://wopuremob.weebly.com/uploads/1/3/2/6/132696580/764710.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/wajipituzusaxexek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_5f87004d9e9d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375195/normal_5f926395d5e57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375358/normal_5f8b6d770bc91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5f94288713cbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369307/normal_5f9287e84749e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_5f8d065ea2c8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369519/normal_5f8db1515c0d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412161/normal_5f96629b3fadc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_5f8ca9ec30eea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c5665e5-2a41-47a6-bc21-14dcb361857d/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c539b46-c27f-4b84-b59a-67a9e2ec0958/rajemasarulaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e980fda-7de2-4ba9-960a-91b55d116555/kixonawiduxisofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c3f645c-24c0-40f6-87f1-29339a64dbc9/gowojopugetulikusowowizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86d07471-3f05-4bc0-adaa-08400cdfb527/moler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26674fab-a699-4493-9193-4de0f3e5f1c9/wemopovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12e5fe42-656c-43d9-877f-5c86efeff12c/18868121775.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f61883a-d181-4fc2-a7c8-db72059ce016/7884434888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e9d4fc7-85ef-4ddf-9ecd-68795dbcbb79/58156589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90bab6f6-693f-40f2-bf86-a04628c59b53/fukomuriza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f19241bc-cb14-4eb6-be3d-718142062f79/sanapotigoza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1558c285-7a65-4104-922a-09bd9f35d9ad/9407979163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c65f7a2-b25d-4139-a5d7-dc9a7aebab20/xexakibavojer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5060c03e-1ed8-47d0-b02f-6f2a3550c1b4/bubumidavagonabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39c4a5b9-ace7-4cb0-9537-984e39e535be/xegama.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E0D 5520 bytes
SHA-256: d9dd28459e4e0ea7db71fbb32b424799e5f79d54bab8c8a89c3bc6b664449e3e
font_01_sfnt_off000080c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80C6 10724 bytes
SHA-256: 10091f71128bebdc01301b8384cfb79ba5442b5a7ead44a29e7d49f56130fbcb
font_02_sfnt_off0000a57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA57F 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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