Malicious PDF — malware analysis report

Static analysis result for SHA-256 391d1299ca32fd0f…

MALICIOUS

PDF

33.4 KB Created: 2020-04-17 02:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1975a1287775005faa2337486c517898 SHA-1: 74a94cceb3e74dcd424d3bd45ae87da4964edb55 SHA-256: 391d1299ca32fd0f70e7a22b7ab8620f09c13e0b33895dface1d6f9840d3b8a9
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, forming a link farm. The ML classifier strongly indicates maliciousness. The primary attack pattern appears to be a redirection scheme, leveraging numerous SEO-optimized PDF files hosted on different subdomains to obscure the ultimate destination. No scripts were extracted, and the document body was heavily obfuscated, preventing a deeper analysis of the immediate user-facing lure.

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://nuwavelocs.com/uploads/1/3/0/2/130291561/130291561.html#film+strip+slideshow+after+effect+template
    • http://futurepeacefulfather.com/uploads/1/3/1/4/131454656/6484274.pdf
    • http://revelstoketheatrecompany.org/uploads/1/3/0/7/130740019/1692167.pdf
    • http://flueandhearthnotes.com/uploads/1/3/1/6/131606578/lekufip_ledesasubar.pdf
    • http://sgarrigues.net/uploads/1/3/1/3/131380612/tegeb.pdf
    • http://zeaglermusiconline.com/uploads/1/3/0/3/130324357/bb5912b0228b6e1.pdf
    • http://jahardwoodfloors.org/uploads/1/3/0/2/130274370/588345.pdf
    • http://curbsideherbs.com/uploads/1/3/1/4/131453170/4858008.pdf
    • http://vernonnjcondorentals.com/uploads/1/3/0/7/130740349/4011364.pdf
    • http://energymanagementplus.com/uploads/1/3/0/6/130604904/6654804.pdf
    • http://hamdenhallfaces.com/uploads/1/3/0/4/130478123/fipomon.pdf
    • http://awcollision.net/uploads/1/3/0/2/130271152/145741ae.pdf
    • http://neo-derm.com/uploads/1/3/1/3/131380480/zalavugasarovulu.pdf
    • http://churchhillproductions.com/uploads/1/3/0/5/130543757/bowobavev-mumegonasode-zagisukunejewor.pdf
    • http://hamdenhallfaces.com/uploa
    • 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_off00005b89.bin
04be6d89fbd8c4ece13fc12976a921c7510b9cc4198234abfdd67011d9724479		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B89 7560 bytes

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