Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ffbcf472cb3d7d…

MALICIOUS

PDF

38.1 KB Created: 2020-08-19 05:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ece0643f2a5edaad44b703d49e9b4000 SHA-1: 922e040b41a437800bda3e8f306e1f837303c611 SHA-256: 13ffbcf472cb3d7dd4ba7e78da68128a4329c5a7db59713cc13f0acfa4db57f3
174 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a server manual, likely intended to trick users into clicking through to malicious infrastructure. The ML classifier strongly indicates malicious intent.

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.cc/pify?keyword=poweredge+r640+manual+pdf
    • http://files.bellemeadedentalcenter.com/uploads/1/3/0/7/130776499/f84e639d.pdf
    • http://files.chilcotinoutfitters.com/uploads/1/3/1/4/131437849/finolonaj_gexopokuxomivut_goruro.pdf
    • http://tijelona.oharaikebananorcal.org/uploads/1/3/1/0/131071243/9114056595.pdf
    • http://files.mrlukewayne.com/uploads/1/3/1/6/131636946/vovuxiselavid.pdf
    • http://xowasina.tyeetonga.org/uploads/1/3/1/3/131384635/d09e43c2de0e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94662163826.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/28636752076.pdf
    • https://cdn.shopify.com/s/files/1/0436/6965/1606/files/38914176861.pdf
    • https://cdn.shopify.com/s/files/1/0434/5197/3799/files/beauty_and_the_beast_piano.pdf
    • https://cdn.shopify.com/s/files/1/0435/8035/8811/files/59955154711.pdf
    • https://cdn.shopify.com/s/files/1/0437/8433/9613/files/msds_benzene_bahasa_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/solve_by_completing_the_square_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/7881/9735/files/69640248329.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8274/files/97392597377.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1038/files/wefomelum.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005461.bin
e9fc232af9b90eb5875a72b192c6a16e82e91255bccde283c20a96bb30287bb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5461 5660 bytes
font_01_sfnt_off000067a8.bin
9d79c45db231dd862ff90a4917e00e440bc48255d6633d4c177d2e8440b94263		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67A8 10480 bytes

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