Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea62e6606b63176…

MALICIOUS

PDF

35.8 KB Created: 2020-06-03 07:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 364ddaa00a59b40cc045875a272b4e14 SHA-1: e5cc3a2474c24fe36315d301becf4708de3292c0 SHA-256: fea62e6606b6317663db6b2eadc21fc1890fa80e59a381aabfb928c6947361c4
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

This PDF file was flagged as malicious by an ML classifier. It contains a large number of external links, many pointing to other PDFs hosted on various domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains URLs that are part of this link farm. The primary attack pattern appears to be SEO poisoning or a similar technique to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://barkersteel.net/uploads/1/3/0/3/130379121/130379121.html#video+game+console+rarity+guide
    • http://yoginioracle.com/uploads/1/3/0/3/130313167/kepadiped.pdf
    • http://aasoftballclub.com/uploads/1/3/0/6/130621278/9322036.pdf
    • http://combinette.com/uploads/1/3/0/7/130738979/vuzude.pdf
    • http://magkasamatayo.com/uploads/1/3/0/5/130589199/bbf616.pdf
    • http://carolinehanstke.com/uploads/1/3/1/8/131872107/lidezidapefopa_xawidoxizo_xubaj.pdf
    • http://lodgepolenagitsuji.com/uploads/1/3/1/4/131454505/160d71.pdf
    • http://wallentingroup.com/uploads/1/3/1/3/131383893/f1c1e7682cea791.pdf
    • http://barkersteel.net/uploads/1/3/0/3/130379121/terms.html
    • http://barkersteel.net/uploads/1/3/0/3/130379121/dmca.html
    • http://barkersteel.net/uploads/1/3/0/3/130379121/policy.html
    • https://nevosoxe.files.wordpress.com/2020/05/movagaziwamifuresadonij.pdf
    • https://gisaxazitem.files.wordpress.com/2020/06/jisonujagogogulapurafixi.pdf
    • https://powudowipu.files.wordpress.com/2020/06/xobewuj.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fea.bin
1c7b54e54e8a085d36949a3ee9dea5b2c675d71464bdbc6873325b5b3900e2a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEA 10384 bytes

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