Malicious PDF — malware analysis report

Static analysis result for SHA-256 402b4a8e8b436ea9…

MALICIOUS

PDF

31.9 KB Created: 2020-06-16 04:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddca1e7a48acdb5c265127b30b337740 SHA-1: 1f72eb831a8b63cd16d45d6c60cba733866698ca SHA-256: 402b4a8e8b436ea946119ca637b9311efe1dd816c73fba4861eee0b9facc9843
94 Risk Score

Malware Insights

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

The PDF document contains a lure for free online accounting tutorials, which redirects to a website hosting a large number of other PDF documents. This behavior is indicative of a link farm or SEO spam campaign, often used to distribute malicious content or generate ad revenue. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://goobylovestim.com/uploads/1/3/2/6/132681293/132681293.html#free+online+accounting+tutorials
    • http://hostmaster.georgiacrook.co.uk/uploads/1/3/0/5/130551456/b27d9a87.pdf
    • http://ravenmarierobins.com/uploads/1/3/0/7/130739756/zipulizudibut-sewerimejapoja-bovivaba.pdf
    • http://ucfskateboarding.com/uploads/1/3/1/3/131380688/73749bad2d0a91d.pdf
    • http://mta-sts.mx.greenband.net/uploads/1/3/1/3/131383325/tezukorikavuriz_paxosegarosix.pdf
    • http://2zm.undesirable.us/uploads/1/3/0/5/130550910/6938965.pdf
    • http://nexusnebulasaga.com/uploads/1/3/1/3/131383476/viforilirotibepo.pdf
    • http://ww.bgcv.org/uploads/1/3/0/7/130739680/wapadurasikinewona.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_off00005235.bin
753cb014e9ba5a1c8a7d9c0d10bf1b63b43fe338d104dcaccb80f87e1c122c78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5235 10200 bytes

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