Malicious PDF — malware analysis report

Static analysis result for SHA-256 35971f881d17dda6…

MALICIOUS

PDF

45.1 KB Created: 2021-06-04 02:52:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 518b7556d4ffc32fe1bf96bc36e69946 SHA-1: a079bac54c9d278da7788a86c9d1515d1ea71537 SHA-256: 35971f881d17dda6f66294b1b190901149ec215b8edde21f9af0b2789d2ed756
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous external links, many of which are disguised as game hacks or generators, indicating a link farm or phishing attempt. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' specifically flags the lure of free game items. While no scripts were directly extracted, the PDF structure and embedded links suggest a malicious workflow designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/431946152/roblox-free-robux-com-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id/repository/oprewards-login_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-realistic-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/spin-and-coin_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/hack-coin-master-game-apk_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/daily-coin-master-free_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/pokemon-go-free-qr-code_GM1094591345.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-hack-app-2021-download_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-roblox-hair-to-wear_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-gold-cards-link-2021ee-spins_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-private-server-roblox_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_004_off0000536a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x536A 25376 bytes
SHA-256: a089b37f67639d63f203ad74df184d496336addaab4288dcbe9b9c070dc3f355
font_01_sfnt_off00008dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD8 18348 bytes
SHA-256: ea71f63ad969ac354b647f6e6da4581b14ed625e24a3109b04dcf91fda1e68c2

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