Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd7830ac76325db…

MALICIOUS

PDF

41.8 KB Created: 2020-08-07 15:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 055bf3b86f1bfed83fca74385ecf8eac SHA-1: 4a3565d53d8c8e77bb833386381209b35ede68f9 SHA-256: 5fd7830ac76325dbc033098e0fcdbc56255cb396b75aa9963242ca3f37098fe4
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.cc/pify?keyword=32+makeup+brushes+and+their+uses+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and numerous other Shopify links, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful sites.

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.cc/pify?keyword=32+makeup+brushes+and+their+uses+pdf
    • http://dujugofi.pwbc.us/uploads/1/3/0/7/130775448/vutariwesit.pdf
    • http://bukixer.boonennedroughtmasters.com/uploads/1/3/0/8/130874058/4816913.pdf
    • http://datuvino.psychiatristsofkansascity.com/uploads/1/3/1/0/131070450/fisokorumaxawo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/attestation_de_salaire_cnss.pdf
    • https://cdn.shopify.com/s/files/1/0430/7078/3645/files/pomepabulefarodoboxim.pdf
    • https://cdn.shopify.com/s/files/1/0433/1608/4891/files/pizokepadosimavu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/16768415064.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1573/files/rezeluvolobivevovigo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9027/1642/files/4496381117.pdf
    • https://cdn.shopify.com/s/files/1/0433/2018/0894/files/mopuxewezudonoxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8580/files/65804160866.pdf
    • https://cdn.shopify.com/s/files/1/0433/4832/8603/files/tesujiwelubemidemex.pdf
    • https://cdn.shopify.com/s/files/1/0427/5693/1751/files/33987396275.pdf
    • https://cdn.shopify.com/s/files/1/0431/0633/6925/files/gitapumexok.pdf
    • https://cdn.shopify.com/s/files/1/0437/8345/4882/files/baviwifevajanugu.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_off000063eb.bin
87b2684b2e494a00ea18b5d423c5d68f6a0f5b65fb2c065c04bcac3383e432d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63EB 5652 bytes
font_01_sfnt_off000076f2.bin
f1d5e207034cebdd4efa563aa1696fb594911c41b13fb22d19fea6470b276ecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76F2 10264 bytes

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