Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f48b7f76caccde3…

MALICIOUS

PDF

32.5 KB Created: 2020-08-10 01:40:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c68c7aa57a5de9e78dd60ebab5e882d0 SHA-1: bad71caf97c730a761b5de1137d5e87900f42f00 SHA-256: 6f48b7f76caccde31a7aadb1ae716b959d98c6ff93a45e357e98389dd81879b5
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing indicating it redirects to known malicious infrastructure via the URL https://ttraff.ru/pify?keyword=bcc+cable+catalog+pdf. Additionally, it exhibits characteristics of a PDF link farm, containing numerous external PDF links, many of which are hosted on Shopify. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector.

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=bcc+cable+catalog+pdf
    • http://files.chanticleer-press.com/uploads/1/3/0/7/130775286/libowagutuk.pdf
    • http://files.writenotions.com/uploads/1/3/1/3/131379353/378356.pdf
    • http://wuvixajiz.crusadersigns.com/uploads/1/3/2/7/132740214/7a8617585999d.pdf
    • http://fasif.leighsbdesigns.com/uploads/1/3/2/8/132814930/7918957.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4314/4359/files/gogabalululiv.pdf
    • https://cdn.shopify.com/s/files/1/0435/3759/6575/files/40240113407.pdf
    • https://cdn.shopify.com/s/files/1/0431/4382/3511/files/40251017433.pdf
    • https://cdn.shopify.com/s/files/1/0435/4516/5975/files/mouse_look_unity.pdf
    • https://cdn.shopify.com/s/files/1/0432/6958/7104/files/poriloxizivedufusaka.pdf
    • https://cdn.shopify.com/s/files/1/0436/5680/6553/files/zolabovefitazomizuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/1575/7214/files/rutumoniduzulimid.pdf
    • https://cdn.shopify.com/s/files/1/0430/0197/0837/files/fulobofijilarod.pdf
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/cressi_leonardo_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0536/9758/files/68874293911.pdf
    • https://cdn.shopify.com/s/files/1/0431/7128/3098/files/nixadezorejewusukowo.pdf
    • https://cdn.shopify.com/s/files/1/0435/8638/8136/files/31207429952.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_off000043fd.bin
46d13cb78c26841e019c4a482ed1fa030d730a790c5552c8d944b2e6334e1662
pdf-font-stream PDF embedded font (sfnt) at offset 0x43FD 5240 bytes
font_01_sfnt_off000055e3.bin
14e4f1547ce2c4a17efb60fd2a1a7318a8de7f86a027a624017203debed7d7c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x55E3 9260 bytes