Malicious PDF — malware analysis report

Static analysis result for SHA-256 c004d510e9e4fbe6…

MALICIOUS

PDF

42.5 KB Created: 2020-03-13 02:49:26 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 32024535b4ce8acf3204f6077bb9de08 SHA-1: a96eb480c50e5cd8458de0d274eb1e595f3efeec SHA-256: c004d510e9e4fbe67378515844ac4c01ed6119e64d27cf117d71315a8da7286d
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO abuse tactic. The document body text, though partially corrupted, mentions 'Best free abs workout app ios', which is likely a lure to direct users to malicious websites. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious redirection.

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://k0i49.salon225.com/uploads/1/3/0/5/130590582/130590582.html#best+free+abs+workout+app+ios
    • http://basculascamry.com/uploads/1/3/0/2/130272452/pepebuwus.pdf
    • http://virtualpoe.com/uploads/1/3/0/4/130483937/423f3bb795090d3.pdf
    • http://737jetcharter.net/uploads/1/3/0/7/130738796/4cc964555eb59.pdf
    • http://theinsulationprosleaguecity.com/uploads/1/3/0/6/130639396/mogavemelejufisugani.pdf
    • http://7daysdietplan.net/uploads/1/3/0/6/130604642/wanaxavozize.pdf
    • http://mail.iloveyouwendy.com/uploads/1/3/0/6/130604732/nataxomuvonupivi.pdf
    • http://havanamoments.com/uploads/1/3/0/5/130588954/finadozugot.pdf
    • http://saxtonsriverdistillery.com/uploads/1/3/0/6/130621378/5d5ddfda73da26.pdf
    • http://www.dapperbeaux.com/uploads/1/3/0/2/130272485/4090897.pdf
    • http://www.unkovich.kiwi/uploads/1/3/0/5/130551006/8355040.pdf
    • http://lisascentralcoast.com/uploads/1/3/0/4/130476976/vewuzi_livid.pdf
    • http://macroveg.com/uploads/1/3/0/4/130483232/gafewabovo-vanapab-wesezupujinij.pdf
    • http://almafuerte.nl/uploads/1/3/0/5/130546392/figofinap.pdf
    • http://luxaficionado.com/uploads/1/3/0/2/130271145/vetazotud_silulupoxelaved_sanutisaluwig.pdf
    • http://www.elevehomesbaguio.com/uploads/1/3/0/7/130775832/5d8b59066.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_off00006ac9.bin
96661535c1427d684209f44f470494653e3a2f16ed6ae68b51610052b8e99991		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC9 7444 bytes
font_01_sfnt_off00008813.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8813 16036 bytes

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