Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca49d7d87c353d62…

MALICIOUS

PDF

42.1 KB Created: 2020-08-09 09:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3c51a6a06ca1ac1c16f29a3d114fd76 SHA-1: 20a3ca201e67f73a0f8c1f7cc86edd1f1c999b47 SHA-256: ca49d7d87c353d6250db01c74f4a6677900ad094462e213376ef67c23631e0a8
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure at 'ttraff.ru'. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be obfuscated but contains the malicious URL.

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=breeam+communities+pdf
    • http://jeriro.oswestrychildminders.co.uk/uploads/1/3/1/0/131071164/difufarik.pdf
    • http://xofofume.averylabradors.com/uploads/1/3/0/8/130813577/pozuzesarukojo.pdf
    • http://ladaluto.ahstherapy.com/uploads/1/3/0/9/130969465/falawutif.pdf
    • https://cdn.shopify.com/s/files/1/0430/7678/0181/files/1126791580.pdf
    • https://cdn.shopify.com/s/files/1/0432/5693/8664/files/67951616029.pdf
    • https://cdn.shopify.com/s/files/1/0430/8008/9760/files/muzimevazoba.pdf
    • https://cdn.shopify.com/s/files/1/0431/4339/7525/files/learn_english_grammar_file.pdf
    • https://cdn.shopify.com/s/files/1/0429/5960/1830/files/bunozapasejege.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1289/files/sogigixu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8308/8547/files/wuwud.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1271/files/goludikawakolil.pdf
    • https://cdn.shopify.com/s/files/1/0439/5152/1947/files/38976471746.pdf
    • https://cdn.shopify.com/s/files/1/0436/0703/1966/files/javascript_array_reduce.pdf
    • https://cdn.shopify.com/s/files/1/0430/5738/1530/files/fobagodowiderizilabimad.pdf
    • https://cdn.shopify.com/s/files/1/0432/9095/1848/files/vovugotasi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/30936358609.pdf
    • https://cdn.shopify.com/s/files/1/0437/5651/9576/files/31891326808.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_off0000659f.bin
116538a9b70f847a3c232516301a39ecc1cb5aac9202ff3ae49711b97ce5700c
pdf-font-stream PDF embedded font (sfnt) at offset 0x659F 5320 bytes
font_01_sfnt_off000077a0.bin
343f322d38b33484fe1711fadeb56c88daceaf60092803e28b07b2f22f9de723
pdf-font-stream PDF embedded font (sfnt) at offset 0x77A0 10568 bytes