Malicious PDF — malware analysis report

Static analysis result for SHA-256 14b2586b1cf0a93b…

MALICIOUS

PDF

38.3 KB Created: 2020-08-30 17:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76212c2dc9274ece8e9bf4256694d36c SHA-1: e3c56c5d430cbbf9a3c0d17b0b61afebcda899c0 SHA-256: 14b2586b1cf0a93b30874fed5208707779f052082c2273b6ba4ffd3988d73a4d
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1539 Steal or Forge Credentials

The PDF contains a malicious redirector link and numerous other PDF links, suggesting it is part of a link farm designed to distribute malicious content. The document body and heuristics indicate a lure to disable security software and harvest one-time codes or MFA approvals, consistent with credential phishing. While no scripts were explicitly extracted, the PDF structure and malicious links point towards an attempt to trick users into compromising their accounts.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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=sony+vegas+pro+13+serial+number
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9286/0327/files/life_selector_credits_generator.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8360/files/speed_test_apk_ad_free.pdf
    • https://cdn.shopify.com/s/files/1/0458/6120/8217/files/59733523305.pdf
    • https://cdn.shopify.com/s/files/1/0430/9552/3485/files/mudotofun.pdf
    • https://cdn.shopify.com/s/files/1/0427/9376/2975/files/the_hunger_games_full_movie.pdf
    • https://static.usrfiles.com/ugd/af0aa9_15a791d45e514b1d941352ec5e94ddd3.pdf
    • https://static.usrfiles.com/ugd/b8c837_59576f33e5104edd9ab1cbd62367a1f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ecf2aca89be4298a7365091a81b1acc.pdf
    • https://static.usrfiles.com/ugd/b8c837_b39d44979e78466ca27f297e536a289a.pdf
    • https://static.usrfiles.com/ugd/cc14e4_d31b6e0eb58a4dff98f5f9f9f367725a.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad486d779b744cffbf4b9b74eba9bf46.pdf
    • https://static.usrfiles.com/ugd/b8c837_15f4411b1b23475ca41555fa8aed14fd.pdf
    • https://static.usrfiles.com/ugd/2e79a6_7d63f8c2e39a4a67afcb9b4588c9d7b1.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_off000054dc.bin
10f9f33de14a90ff585342ad5b37b3b769992b9cabdfa9b2b85c0e35330d7354		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54DC 5760 bytes
font_01_sfnt_off00006872.bin
eb7edc1bb9310d77d4c7d7f26b5703e6bd948a46a82bf03e4afe16c8236d1f62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6872 10300 bytes

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