Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d483b5e336390d7…

MALICIOUS

PDF

50.9 KB Created: 2021-01-08 16:59:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f651675cfab8f2d75e28925eb7e6ab22 SHA-1: 17280f38e165456cfbeaa3dd8c891eb38688af01 SHA-256: 3d483b5e336390d7f0658bbc69d58f373c2901658791dd129f7c26f6a44ad4f4
124 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URIs, 'https://traffine.ru/123?utm_term=brookfield+public+library+brookfield+illinois', is likely part of this farm. While no scripts were explicitly extracted, the PDF structure and the presence of external links indicate a potential for redirecting users to malicious sites or further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8788

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 https://traffine.ru/123?utm_term=brookfield+public+library+brookfield+illinois
    • https://cdn-cms.f-static.net/uploads/4380226/normal_5fa84b130bb3c.pdf
    • https://cdn-cms.f-static.net/uploads/4455376/normal_5fa7bf49a88e1.pdf
    • https://pofumojonoro.weebly.com/uploads/1/3/4/4/134474045/mobuzesu-redigixutexato-tunaxet.pdf
    • https://kidudowo.weebly.com/uploads/1/3/4/3/134318554/jijenimutepufim.pdf
    • https://dataremidesop.weebly.com/uploads/1/3/4/6/134697992/geninipoxeresux-ruvovuba.pdf
    • https://cdn.sqhk.co/joxomawezu/rHjbDcS/human_heart_3d_model_free.pdf
    • https://pewoxunoxosizix.weebly.com/uploads/1/3/4/3/134318290/41a73237.pdf
    • https://teliwunamadawab.weebly.com/uploads/1/3/1/3/131381891/b36e579ea6f6.pdf
    • https://cdn.sqhk.co/jedelamodafa/IKjeGjf/zombie_army_4_dead_war_ps4_co_op.pdf
    • https://tirusagoxavux.weebly.com/uploads/1/3/5/3/135329940/waxigavasoxep-letomiwikot-mibumisemenis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ebcb98ed-1dbf-4c97-95ed-7d2561d953b6/10667295064.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba8e.bin
5566a52867eec1076ae64b8fc91b0a5f5759b5a72314202aadddb598477e248c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8E 5504 bytes

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