Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f80b677e8b4d1a4…

MALICIOUS

PDF

34.5 KB Created: 2021-07-04 09:44:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 28533d33494b729e05f6911b8c6a84d4 SHA-1: 83aa0ae9dcdc4a7c9489980a613707c7dd692d69 SHA-256: 9f80b677e8b4d1a45cde44d0580d09dcf737feef0b8bbb5f0e595c80546f24c5
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://netcdn.tw/app/431946152/free-roblox-generator-game-hack PDF link annotation
    • http://lib.unar.ac.id/repository/free-spins-coin-master-links-app_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/free-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/roblox-gift-card-free-codes_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/game-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/coin-master-hack-spin-generator-tool_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/how-do-i-earn-robux_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/what-are-the-effects-of-free-robux-scams_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/how-to-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/real-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/fake-robux-codes_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/coin-master-game-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/minecraft-survival-free_GM479516143.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/clean-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/free-google-play-promo-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/coin-master-free-spin-link-today-16-11-2021_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000031db.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31DB 22800 bytes
SHA-256: 8aa1aff2b3711b40de0c5107926b35554903293c8bf2144dcf09bc1bd964d806
font_01_sfnt_off000064e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64E1 18752 bytes
SHA-256: 7a858cebcbb43583261fc6928f7757faac90e9e6cc2d406a534a148fe309e18e

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