Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b6e71499ceed35…

MALICIOUS

PDF

43.2 KB Created: 2020-08-09 23:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33301d0e123f0f51154c3e521f0a0b84 SHA-1: afa6c766340f7ba8b5efe6b894894d66054735b9 SHA-256: c6b6e71499ceed35589a030aba8a8c4d7da973768d0bce598f84f81305034f58
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link redirects to a known malicious infrastructure at ttraff.cc. This suggests a lure to download or view a PDF, which then redirects the user to a malicious site. The ML classifier strongly supports the malicious nature of this PDF.

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=cryptocurrency+mining+for+dummies+pdf
    • http://files.etnomusikologiusu.com/uploads/1/3/1/4/131438259/b58f18.pdf
    • http://files.everythingsjakehere.com/uploads/1/3/1/0/131069766/14c5fdd4ad8.pdf
    • http://files.bethlehemhousewma.org/uploads/1/3/0/7/130775192/907935.pdf
    • https://cdn.shopify.com/s/files/1/0437/5658/5114/files/62979637111.pdf
    • https://cdn.shopify.com/s/files/1/0432/3141/2379/files/53029229037.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/nijabitaponagi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0087/3631/files/xekajod.pdf
    • https://cdn.shopify.com/s/files/1/0435/7668/8799/files/dekawu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gabagijujusudizal.pdf
    • https://cdn.shopify.com/s/files/1/0439/0735/0696/files/84733036060.pdf
    • https://cdn.shopify.com/s/files/1/0437/1139/8041/files/80910681843.pdf
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/50227629151.pdf
    • https://cdn.shopify.com/s/files/1/0434/3418/0769/files/85343680175.pdf
    • https://cdn.shopify.com/s/files/1/0433/0291/2168/files/12938794113.pdf
    • https://cdn.shopify.com/s/files/1/0437/7182/2229/files/10678537823.pdf
    • https://cdn.shopify.com/s/files/1/0431/7937/6798/files/46769512314.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_off00006b07.bin
9fe0dcf0911e8040dc8e283e9b69b3ccd979c28135d3385b67474da2b94cc0ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B07 5240 bytes
font_01_sfnt_off00007cd6.bin
247d4e084f7736c7b4c13e83152d691733b2bc9b34dd02f1d99553c02e11cda8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD6 10196 bytes