Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c3cb23df57d664…

MALICIOUS

PDF

44.5 KB Created: 2020-10-27 05:42:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4550ece41335443a21e634c3f89fc85f SHA-1: bf407b855d32c7abba81c88bcd42c13954a4cee3 SHA-256: 70c3cb23df57d664bc01b6b6bd73d5fc82775b92f3693766fc30ea43b4cea6ed
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to artificially inflate search engine rankings. One of these links, https://ttraff.ru/123?keyword=itil+study+guide+2014+pdf, is identified as a malicious redirector. This suggests the document's primary purpose is to direct users to malicious infrastructure, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ttraff.ru/123?keyword=itil+study+guide+2014+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368492/normal_5f894198b148c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406775/normal_5f93e6f2c94d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382407/normal_5f8c2178ea924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_5f87ad9fe6196.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370092/normal_5f932370e9432.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5f87289c772da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_5f8729b2e0097.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407085/normal_5f939f337ca91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403823/normal_5f91423e4ee6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369334/normal_5f9379a24247a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_5f8ece35279c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_5f97475d4006d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387235/normal_5f8ed35f5d3c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5f8ec22c453b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367648/normal_5f936eae34c7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374848/normal_5f8cc37d6d550.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5f880d8fd4fd6.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/4c76203c-60ac-43c7-aaf4-e4e1e602d614/japipatuxodibud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e47958d3-1174-48af-a2e7-88dfedb9af86/vacaciones_santillana_100_problemas_para_repasar_matematicas_4_primaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dba21e49-637f-43aa-8049-0d2cb8ccd5bf/verogu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6249/1286/files/you_spin_my_head_around_lyrics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/0900/3687/files/change_default_reader_android_tablet.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB4 5356 bytes
SHA-256: 32d7262eaff6601c9b1b6e554dd8890f1f01e70f9fb503907bc5f4e22fc26460
font_01_sfnt_off00008014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8014 10868 bytes
SHA-256: e2f7849927d1a81cde0ee22d2ef82df5d40b794502b5c8aa0359c3913126ec06

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