Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca63ab0f4d03e74…

MALICIOUS

PDF

39.8 KB Created: 2020-04-24 13:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 100438d1a45d1d747df57d2bbdd8aa09 SHA-1: 9c2f830669f41ff82d0762119e39bc7b7327ccaa SHA-256: aca63ab0f4d03e74ee4742dafa79b765063df7f8fbd24a6f7fd07e9855093cee
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of external links, many pointing to PDF files, characteristic of a link farm or SEO spam campaign. The document body, though heavily obfuscated, contains the phrase 'good night picture message free' and an embedded URL, suggesting a lure to external content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs further supports a malicious intent, likely to drive traffic to malicious sites or host further malware.

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://aaagaragedoorsmd.com/uploads/1/3/0/4/130478067/130478067.html#good+night+picture+message+free
    • http://dopetrapbeatz.com/uploads/1/3/0/6/130605173/0016fc076c8.pdf
    • http://schaegg.com/uploads/1/3/1/3/131379115/rexisameb.pdf
    • http://maverixconsulting.com/uploads/1/3/0/3/130379625/7399606.pdf
    • http://thestudioholland.org/uploads/1/3/1/4/131453179/09c7d9.pdf
    • http://baubles-n-bling4u.com/uploads/1/3/0/7/130739046/furipivepum.pdf
    • http://theimaginationedge.com/uploads/1/3/0/7/130776646/331b7a261.pdf
    • http://sweetteakitchen.net/uploads/1/3/0/6/130604820/bowowudibav_toxabemininub_bumanafeg.pdf
    • http://ritualskincraft.com/uploads/1/3/1/6/131606762/giwuno_gedil.pdf
    • http://epricer.com/uploads/1/3/0/2/130274017/349c58.pdf
    • http://danburdettretirement.com/uploads/1/3/1/4/131483067/9165237.pdf
    • http://immersivesoundexperience.com/uploads/1/3/0/4/130488101/1240609.pdf
    • http://rshscardinals75.com/uploads/1/3/0/7/130775666/8041463.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_off0000757f.bin
e2a0b23a8ca1bcbfcc031f40d943bae456dd538933b95a76b1f987a980f7252e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x757F 7628 bytes

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