Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aaec77f51f0b3ff…

MALICIOUS

PDF

43.2 KB Created: 2020-04-29 02:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f18f77bc196631ecd76c0d50ae452ad5 SHA-1: d486ce30d2cc312e8b06a48c24c047249a793ddb SHA-256: 4aaec77f51f0b3ff85c76e01100bc2dccda5c547adab54ba539285393ddf9c5b
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, indicating a link farm designed to distribute malicious content. The document body, though partially corrupted, contains the phrase 'Trout fishing guide broken bow ok', suggesting a lure to entice users to click on the embedded links. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a distribution campaign.

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://northeastminneapoliselectrician.com/uploads/1/3/1/8/131871701/131871701.html#trout+fishing+guide+broken+bow+ok
    • http://secondamendmentcrossfit.com/uploads/1/3/0/4/130478520/8073f569047.pdf
    • http://kiinteisto.eu/uploads/1/3/0/3/130323405/narupamesukadu-mubakaka-zaxejipolozi-sujuponopi.pdf
    • http://martin-mchugh.com/uploads/1/3/1/4/131410434/lupudu-fosuwi-sijelutub-reraxi.pdf
    • http://flava99.com/uploads/1/3/1/6/131607239/a396c7a8.pdf
    • http://youngandawake.nl/uploads/1/3/0/4/130488661/438627.pdf
    • http://aamg.company/uploads/1/3/1/3/131398268/017347.pdf
    • http://hkcarpetcleaning.com/uploads/1/3/0/4/130476573/c94494.pdf
    • http://nuvoleonline.com/uploads/1/3/0/7/130739723/sofol.pdf
    • http://thejourney.vip/uploads/1/3/0/5/130539244/vunenokotuw.pdf
    • http://danishrescueadoptadog.com/uploads/1/3/0/9/130969541/ximupurufuj.pdf
    • http://rebeccagoleneportfolio.com/uploads/1/3/0/4/130483769/kanos.pdf
    • http://freedomliving.info/uploads/1/3/1/4/131453405/sifuguxuluduni-zatitix-tumigopugakas.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067cf.bin
334baaa8c554a7c623fb7fa5297ce39f0a31a42fd616e9a16ee4aaaeb42e9ae7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67CF 8996 bytes
font_01_sfnt_off00008a17.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A17 16036 bytes

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