Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1151cf627a967f…

MALICIOUS

PDF

44.5 KB Created: 2020-08-02 20:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11a0a017f52ab54024bd825cff9c23aa SHA-1: ff07db4e791afc0ce32b909aed9ba93235e09ff5 SHA-256: 6c1151cf627a967f60bef65cd6bc77f9833ae433e8dd2e615869e0225502ae2a
174 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that points to a known malicious redirector. The presence of numerous external PDF links suggests a link farm or redirection strategy to obscure the final malicious destination. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/pify?keyword=john+deere+175+hydro
    • http://files.epiphroncapitalgroup.com/uploads/1/3/1/4/131483148/dexuzafitot_mewinusewik_sovukibe_xifot.pdf
    • http://files.csbwest.com/uploads/1/3/1/8/131857112/9ea70eadb.pdf
    • http://files.littmanncinema.com/uploads/1/3/1/4/131408899/viwawali_fuwudunajadina.pdf
    • http://files.firstbaptistpocomoke.org/uploads/1/3/2/7/132712116/d6e6a8.pdf
    • http://files.shop-222.com/uploads/1/3/0/8/130874205/755959.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/8316/0999/files/21509732327.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45292738862.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45366335679.pdf
    • https://cdn.shopify.com/s/files/1/0433/6097/7048/files/fozusumatisomuwevino.pdf
    • https://cdn.shopify.com/s/files/1/0428/1673/3340/files/fogodimujobume.pdf
    • https://cdn.shopify.com/s/files/1/0430/9699/8048/files/37221276792.pdf
    • https://cdn.shopify.com/s/files/1/0432/6352/5029/files/16066640033.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/zifobodalanatusamuxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6448/3240/files/venatofa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7761/5262/files/dotamaxalajavaweraxutu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8947/7273/files/91997574150.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061c2.bin
774c1eca7f2279ccce9117331c4e1739115750ea9b34f081a0aae9a744c2fd72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61C2 4500 bytes
font_01_sfnt_off00007101.bin
3dbc079f0aa3648e1ac581fe6135c81ff409a12dcc4d9c974a5099d647f9c16f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7101 11188 bytes
font_02_sfnt_off00009726.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9726 4324 bytes

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