Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a419c55343c11cf…

MALICIOUS

PDF

41.5 KB Created: 2020-08-05 00:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 655e95ef18ba23178766894003049e1d SHA-1: 322894ef84f6d760389d0f768a7313fb64a0e92e SHA-256: 6a419c55343c11cf6bc90b044f337828e9a4b17413fd54bba9c3e6d46e9d8757
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. This suggests a link farm or redirection scheme designed to obscure the ultimate malicious destination. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a phishing or redirection attack.

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=microbiologia+bacteriologia+y+virologia+pdf
    • http://files.onsacredgroundlandtrust.org/uploads/1/3/0/7/130739719/kofupaxifuxo.pdf
    • http://files.access2college.com/uploads/1/3/0/7/130739227/fogogiv.pdf
    • http://sagibagom.soulrecoveryandalusia.com/uploads/1/3/1/4/131453284/5919024.pdf
    • http://files.mosaicsbyvirgene.com/uploads/1/3/0/7/130739924/e1312e16a4b.pdf
    • http://files.funnyfarmanimalsanctuary.org/uploads/1/3/0/8/130874634/toxuvuza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/11660791019.pdf
    • https://cdn.shopify.com/s/files/1/0436/3000/2336/files/kewerevepivabe.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5431/files/likivorigitaditewirupa.pdf
    • https://cdn.shopify.com/s/files/1/0435/8445/4817/files/85516826477.pdf
    • https://cdn.shopify.com/s/files/1/0434/3663/8360/files/chaseonline._chase._com_myaccounts._aspx.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/72975443876.pdf
    • https://cdn.shopify.com/s/files/1/0435/5905/9615/files/56953727718.pdf
    • https://cdn.shopify.com/s/files/1/0430/8375/9765/files/gurajib.pdf
    • https://cdn.shopify.com/s/files/1/0429/5163/9196/files/serorolepuruxefebibuwu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4145/4240/files/fomujuzoleripiled.pdf
    • https://cdn.shopify.com/s/files/1/0428/5209/0022/files/idm_full_toolkit.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_off000062f0.bin
8e8859c8cda85e57ec525f67f094851961e522d9d0be9572f73f15561786c8e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F0 5452 bytes
font_01_sfnt_off000075a6.bin
e6ba48f10d8326ab441e4d572ed48d87881ed101fe3a59e41de48097d4f2dc15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75A6 9736 bytes

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