Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d0b8601fc98c6c9…

MALICIOUS

PDF

34.6 KB Created: 2021-07-03 13:13:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5399b9231ccc494cfc1b68e8aa6541bb SHA-1: d56a8a17f3e3f42ca7ee6aacc83caf34966015c2 SHA-256: 7d0b8601fc98c6c92fc0186b67434a1d87ac2c67aef67695e53f3fbe95a9dcde
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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.tw/app/431946152/como-hackear-la-cuenta-de-tu-amigo-roblox-game-hack PDF link annotation
    • http://library.stembi.ac.id/repository/how-to-hack-roblox-to-grt-robux-the-easy-way_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-have-free-robux-with-site_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/snowed-out-v2-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-hack-someone-on-roblox-2021-2021_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-hack-roblox-pokemon-universe_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/code-hack-robuxtext_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/how-to-get-free-vip-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-lumber-tycoon-2-pc-hack_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/code-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/tiktok-views-free_GM835599320.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-free-headphones_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/get-free-robux-by-entering-this-birthday_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/roblox-how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/anzeigewwwwowcom-roblox-cheats-free_GM431946152.pdfIn PDF document text
    • http://library.stembi.ac.id/repository/hack-dungeon-quest-roblox-2021_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_off00002f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F33 22436 bytes
SHA-256: 8a3406175420ca8cd4e9712897bdad5dd7a9c721b8815323bc5a057672d315e2
font_01_sfnt_off0000613c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x613C 19448 bytes
SHA-256: e116a2fa00716e8718ddf9af057e0deeaf0aa8562a530dc3d4bad871f656bbde

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