Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d50e016ca94a49…

MALICIOUS

PDF

48.4 KB Created: 2020-08-07 18:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 294e581b13eb3b50385d8b22805a152a SHA-1: 1e2c2980a08a4f69c7089f331fbbf85f3c15412e SHA-256: 91d50e016ca94a498093484201b97a2abd91dd7f4ab77cc25684a1cb45cdf14b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a download for "cardiac surgery books pdf". The document body and heuristics indicate a large number of embedded links, many pointing to Shopify domains, likely part of a link farm designed to obscure the malicious redirector. The primary malicious IOC is the redirector URL, which is used to funnel victims to further malicious content.

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.com/pify?keyword=cardiac+surgery+books+pdf
    • http://files.southsidepsych.com/uploads/1/3/2/8/132814343/tojoz.pdf
    • http://files.denvermobilehair.com/uploads/1/3/1/4/131409526/4635715.pdf
    • http://files.eyeslikemineinc.org/uploads/1/3/1/4/131482819/9763944.pdf
    • https://cdn.shopify.com/s/files/1/0434/6337/7048/files/curriculum_vitae_europass.pdf
    • https://cdn.shopify.com/s/files/1/0437/8837/0072/files/ranch_king_mower.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3760/files/bapaxukiwole.pdf
    • https://cdn.shopify.com/s/files/1/0431/4716/5850/files/physical_science_p1_november_2020_memo_grade_11.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zexula.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nakoximowukod.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98973723668.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/19932918135.pdf
    • https://cdn.shopify.com/s/files/1/0432/5382/5694/files/4808114402.pdf
    • https://cdn.shopify.com/s/files/1/0434/1327/4780/files/fijawavi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/super_mario_playstation_3.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75901524911.pdf
    • https://cdn.shopify.com/s/files/1/0437/6169/6925/files/japawa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067d3.bin
f714d2a6f0671a34d3c7a82932021da3be8b4d2f0ca3fe6834d3d2d6131986e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67D3 5316 bytes
font_01_sfnt_off00007a01.bin
9f828b2b1df013ddd4d9b93386be972be6e15b84ceaef02043345f96eb8b639d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A01 13968 bytes
font_02_sfnt_off0000a69c.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA69C 4324 bytes

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