Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a1318454cbbd83…

MALICIOUS

PDF

38.6 KB Created: 2020-04-17 12:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 49546c8fe40dabaa407f724b6a155e6e SHA-1: 4827ee9a55590c407b9c37d3e96ddbc6d1f3de45 SHA-256: 02a1318454cbbd831ae3b5a4bd7ccb852b2ffccbe2290d228955fb2c5c4dfdc3
144 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to other PDFs hosted on various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass link farm, suggesting a tactic to distribute malicious content or engage in SEO manipulation. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick users into downloading further malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drobgyn.net/uploads/1/3/0/6/130605374/130605374.html#english+listening+mp4+free
    • http://metroartdesign.com/uploads/1/3/0/6/130621809/soguvogapozu.pdf
    • http://wishbonesje.net/uploads/1/3/0/5/130588257/3311f3493.pdf
    • http://3d-soles.com/uploads/1/3/0/7/130775743/somapo.pdf
    • http://undertheparadisebridge.com/uploads/1/3/1/3/131384135/ef19d8160.pdf
    • http://playtowinconsulting.com/uploads/1/3/0/6/130604307/653353502b.pdf
    • http://alabamainshorecharters.com/uploads/1/3/0/6/130621940/9702380.pdf
    • http://stallionpridecapitalmanagement.com/uploads/1/3/0/5/130541662/tujene_xixexajamo_demejife_zisofudipiv.pdf
    • http://petroclasses.com/uploads/1/3/0/5/130589391/6321290.pdf
    • http://cypressbaybaseball.com/uploads/1/3/0/2/130289565/ce15f63c3.pdf
    • http://attentionaustin.com/uploads/1/3/0/7/130776025/bugizuxerob.pdf
    • http://mephisthon-shop.org/uploads/1/3/0/6/130604803/tazirukamap.pdf
    • http://soulmatesandpassports.com/uploads/1/3/0/8/130813692/zilevarawotili.pdf
    • http://nychooloflaughteryoga.com/uploads/1/3/0/3/130379297/mupokig.pdf
    • http://chelseagould.com/uploads/1/3/0/8/130814588/karezatowomu-sujuleva-nixukavusisad.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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006577.bin
1c7afcb66cf20c1f7f8ca80c037aa84aaab50bb92645f7d97871025a72355c72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6577 8000 bytes
font_01_sfnt_off00008471.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8471 2616 bytes

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