Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ce52e4b387c8b3…

MALICIOUS

PDF

40.2 KB Created: 2020-08-31 09:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29c7a689764a7a28666d37dcd3dc31c7 SHA-1: 1edae89ab056a8c5f318cf4380194cafd89e0468 SHA-256: 72ce52e4b387c8b3701d62acb0c2d7ac396358d3f6897fffda2e6e9a97a9b446
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, disguised with keywords related to accounting software. It also features a large number of embedded links, many pointing to PDF files, suggesting a link farm or SEO manipulation tactic. The presence of a callback lure further indicates a phishing or scam attempt.

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/wix?keyword=peachtree+complete+accounting+softwa
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_3ba1575a95e042ae8e625d3dd533067c.pdf
    • https://static.usrfiles.com/ugd/07625c_76bec8b2455b4d1da8e820c9bd722a57.pdf
    • https://static.usrfiles.com/ugd/6f58fb_c3f4ab2b1f9c4ad5998bc0eec8f2ceca.pdf
    • https://static.usrfiles.com/ugd/b8c837_893b824729e540a7a7df4385467bf7b6.pdf
    • https://static.usrfiles.com/ugd/b8c837_931b0e9b7100493282f08215d2cce20d.pdf
    • https://cdn.shopify.com/s/files/1/0465/2154/8958/files/disputing_credit_report_credit_karma.pdf
    • https://cdn.shopify.com/s/files/1/0429/4914/8828/files/latesezogokisa.pdf
    • https://cdn.shopify.com/s/files/1/0430/7786/1527/files/46722399940.pdf
    • https://cdn.shopify.com/s/files/1/0434/2670/9665/files/libro_temperamentos_transformados.pdf
    • https://cdn.shopify.com/s/files/1/0431/2124/6359/files/basic_concepts_of_coordination_chemistry.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_off00005bdf.bin
4be1670546aa6e74404890c13ab1552fe2e8a4ce4530d94ad92586eae796dc33
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BDF 5520 bytes
font_01_sfnt_off00006e90.bin
9dfbe68009eff095062dcfdf05d30e401936ded377d3e9437b5106df32a313d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E90 11316 bytes