Malicious PDF — malware analysis report

Static analysis result for SHA-256 6630a79dfff0294f…

MALICIOUS

PDF

38.8 KB Created: 2020-05-24 08:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2361328df93114de337d523a899ea4ce SHA-1: be81ef6612d5a88f8012ec2c01ea7e4233128670 SHA-256: 6630a79dfff0294fa9b98daf1c67966032f26728a7ff502c2ec3aac4cf96921a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious due to its structure, which includes a large number of external links disguised as content related to 'Praxis ii social studies passing score'. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link-farming or redirection scheme. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence point towards a malicious intent, likely to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://wallstreetbullmkt.com/uploads/1/3/1/4/131438397/131438397.html#praxis+ii+social+studies+passing+score
    • http://msgholdingsbenefits.com/uploads/1/3/0/2/130289346/joxaregujuve.pdf
    • http://aston.website/uploads/1/3/0/3/130379297/rijumaxe.pdf
    • http://beautystayzallday.com/uploads/1/3/0/6/130604651/jesejerixome-tufixakibuxalam-vujividoporo-witivopogovux.pdf
    • http://athletica4.org/uploads/1/3/1/4/131409463/fabupilape_pejonupofonavo_kazenafe_ropemupatupes.pdf
    • http://pragyamishra.com/uploads/1/3/0/6/130621626/7575802.pdf
    • http://boudreauxsbbq.com/uploads/1/3/1/6/131637409/falonapoga.pdf
    • http://avoiceforchildren.org/uploads/1/3/0/5/130588222/cef90.pdf
    • http://sarahfuchssampson.org/uploads/1/3/0/6/130621201/lowamizupu-midotagupu-veretibiguzo-nefam.pdf
    • http://sacredrootsohio.com/uploads/1/3/0/6/130621703/kuwefitob-torupivegol.pdf
    • http://mta-sts.buenafarrellphotography.com/uploads/1/3/0/7/130776219/dedejotubamezi_sifupigozopujet_titekazovezane_valabeg.pdf
    • http://coachorunning.com/uploads/1/3/0/9/130969372/6560919.pdf
    • http://hey-pretty.com/uploads/1/3/0/6/130622111/21f3539ea.pdf
    • http://mastersvineyard.org/uploads/1/3/1/3/131398088/d58f6a.pdf
    • http://chaletalpemassif.com/uploads/1/3/0/2/130272501/fedexavegijanol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ac0.bin
cbf659fd83cfa779344bb6df4ee87c1ca09f3bf3459331a68101dfbff78dc671		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC0 10988 bytes

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