Malicious PDF — malware analysis report

Static analysis result for SHA-256 be448d25be601cd3…

MALICIOUS

PDF

51.5 KB Created: 2020-11-01 19:53:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2ed1051847a70a76d5b0851ca67e0603 SHA-1: 8eb14e606b6c23423efebacf08601d730f18781a SHA-256: be448d25be601cd3594b68815d1f52f5a5bb524c71efff4ce6c3f7a25d76da0f
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body text, though heavily obfuscated, contains a URL that appears to be a lure for downloading an 'apk'. The presence of numerous external PDF links also suggests a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness.

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=learn+to+fly+apk+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376874/normal_5f91e22cb35e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_5f8a69487ad88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5f8f05cb5fe31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f8f58365aaf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370319/normal_5f9c06f6b8341.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368985/normal_5f91028f73923.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/f84b4d9a-ad1c-417b-b937-a40ef5181a6a/45314379233.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa60034a-e198-4942-a90d-5b5d75d12e48/fenexoboxinojez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ab15d7d-5612-4a3c-954b-4fdaa6f068a6/adjectives_that_start_with_f.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5096330-4d05-4f8c-a00a-170dde36ceee/lenovo_is6xm_motherboard_f_panel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/247246e4-1c82-4b3e-aca1-405fb40c8719/70435616747.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/4303/5562/files/economia_naranja_bid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a46f3c-7058-44f5-8829-87a19027900a/tafigonenavelujidefod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7665ea05-fc33-431d-811b-58f170c24e3d/cty_cp_thc_phm_thy_sn_an_pht.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA6 5056 bytes
SHA-256: fd723c23abca6e0eca272aa495dda07b0e9c1bd14257cdee00e109a45f407fc1
font_01_sfnt_off00006d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D02 7164 bytes
SHA-256: 6ff675729b71a6aa084e794acacf25f4e998265f142c15d93ee48ef3ed2991f5
font_02_sfnt_off000085bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85BC 11204 bytes
SHA-256: fafa81e13534cc3e9198ecbbd4d8a11305f59a7952e62d533d9be4b08d7f6218
font_03_sfnt_off0000ac37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC37 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb

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