Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f1a38adf67df49…

MALICIOUS

PDF

34.0 KB Created: 2021-06-27 20:43:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9031b159de19f960398852180d45af11 SHA-1: aa3f150871810cd82ecbc05a94e2dfb74535d21f SHA-256: b2f1a38adf67df49dd4ed78e669c1b479bd6ab07ebe0f98663bdfe9282524b46
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple external links, including one to 'netcdn.co' and numerous others hosted on 'lib.untad.ac.id', all using lures related to game hacks and in-game currency. This suggests a link farm or SEO manipulation tactic to drive traffic to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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
  • 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.co/app/479516143/free-24-7-minecraft-server-game-hack PDF link annotation
    • http://lib.untad.ac.id/repository/robux-for-free-no-robot_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-free-avatar-drawing_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-cheat-in-roblox-glitch_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-minecraft-no-virus-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/free-draw-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/descargar-roblox-hackeado-adopt-me-para-pc_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/youtube-como-ser-hacker-en-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/infinite-robux-no-human-verification-hack_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/pokemon-go-free-pokeballs-promo-code_GM1094591345.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/roblox-earn_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/nisterv-free-robux-hack-youtube_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-money-hack-xbox-one_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/imperium-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-hack-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-free-admin-tc2_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/gift-robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-coin-hack_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-rules-cheating_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
font_00_sfnt_off000032b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32B9 21612 bytes
SHA-256: 5d5148eaf803f01f7a0d49faa843585a8a734e89c2100b7bc7284f44bd3b57e5
font_01_sfnt_off00006211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6211 18212 bytes
SHA-256: dc240a4c7f6d6ef542df3e92dc5e6be0114423f2adfadbc72c3334056908e6df

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