Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c98bb035dc7d30…

MALICIOUS

PDF

41.2 KB Created: 2020-08-22 13:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7942c228251f60e242ac0940271c131 SHA-1: 23301cfabc5af6c7073585fd754961639166c974 SHA-256: a2c98bb035dc7d3012777084ccff818d4eafada0709cf147596721895210bdb7
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.ru/pify?keyword=biceps+workout+at+gym+pdf, which is likely used to redirect users to further malicious content. The document body, though heavily obfuscated, contains references to the redirector URL, reinforcing its role in the attack. The presence of a large number of external PDF links also suggests a link farm or SEO poisoning tactic.

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.ru/pify?keyword=biceps+workout+at+gym+pdf
    • http://files.louisemyersteachingeportfolio.com/uploads/1/3/0/9/130969057/bubulavoxojusimefuwe.pdf
    • https://cdn.shop
    • https://cdn.shopify.com/s/files/1/0434/3182/1468/files/bbc_english_grammar_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0431/6741/6471/files/xibuxozisonoparej.pdf
    • https://cdn.shopify.com/s/files/1/0430/8375/9765/files/driver_tool_kit_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0437/6199/1841/files/adobe_indesign_cs6_full_version_crack_keygen.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5814/files/86957091224.pdf
    • https://cdn.shopify.com/s/files/1/0431/5086/8646/files/gamunabi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7857/3464/files/46379508566.pdf
    • https://cdn.shopify.com/s/files/1/0431/4782/1212/files/8322260308.pdf
    • https://cdn.shopify.com/s/files/1/0431/8953/4869/files/topotexevirul.pdf
    • https://cdn.shopify.com/s/files/1/0448/5352/6690/files/barnyard_dance_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/posaselidevasomi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3755/5864/files/cobalt_soul_monk.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006286.bin
48cf4d2eeb33003406b9af9d8872b50b704ad391d24a23a71693201a38f3cd56
pdf-font-stream PDF embedded font (sfnt) at offset 0x6286 5752 bytes
font_01_sfnt_off00007620.bin
9cf448e367a7b8d8a46abe4ac32360e04f92a40ec894eea7007bc4904b668890
pdf-font-stream PDF embedded font (sfnt) at offset 0x7620 9940 bytes