Malicious PDF — malware analysis report

Static analysis result for SHA-256 e732eb9145a9d123…

MALICIOUS

PDF

35.4 KB Created: 2021-07-06 04:31:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d850b1cd14df5be9872e23c1d03c932b SHA-1: e21b491f30e571636795894c6f7b494130881fdc SHA-256: e732eb9145a9d1231fc9a6a3f24d0ec0a1e8ea9c91f6d7a743f3a21d20124734
142 Risk Score

Malware Insights

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

The PDF document contains numerous links to websites offering game hacks and free in-game currency, a common lure for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a malicious intent to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious campaign leveraging social engineering.

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/how-to-hack-robux-game-hack PDF link annotation
    • http://lib.icbc-indonesia.org//repository/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-robux-random-number-gen_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/robux-hack-no-verification-legit_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-tiradas-gratis-2021_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/is-there-any-tricks-or-working-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/hack-roblox-2021-17-de-junio_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-get-free-exotics-in-roblox-assassin_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/is-roblox-free-on-chromebook_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-hack-roblox-robux-with-cheat-engine-66_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-golden-card-hack_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/candy-cheats-in-murder-mystery-2-roblox_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-outfit-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-vip-for-roblox-free-video-star-egg_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/what-is-the-password-for-roblox-money-hack_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-code-hack-robux_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-hacks-and-cheats_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/minecraft-games-free-download_GM479516143.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_off00003325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3325 22624 bytes
SHA-256: 0ded55a7df4ebfb13ae8f034f63954379ef46d783766cf33ffd2ff61f541c315
font_01_sfnt_off000065bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65BB 18884 bytes
SHA-256: eabb09a914750731f64ad11a0b688188fe1798403d7ade495959fd69a4976413

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