Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b555fd2f4c30e25…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 22:10:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2de801729b17e332c2424b30817e5a41 SHA-1: 536fe9a28f97da0f503aeee0b2c8add88acba182 SHA-256: 8b555fd2f4c30e256bc6ee225be19739cd897242699a02bed607b8782ea1db9a
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to websites offering game hacks and free in-game currency, such as 'how-to-hack-coin-master-root-game-hack'. Heuristics indicate these links point to malicious redirectors and a large external PDF link farm, suggesting a phishing or scam campaign. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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
  • 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/406889139/how-to-hack-coin-master-root-game-hack In PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/100-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/hackear-roblox-para-tener-robux_GM431946152.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/roblox-apocalypse-rising-spawn-hack_GM431946152.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/roblox-eploite-for-free-download_GM431946152.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/minecraft-thumbnail-maker-free_GM479516143.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/how-to-get-more-followers-on-tiktok-free_GM835599320.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/clean-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/coin-master-pc-hack_GM406889139.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/how-to-get-free-robux-in-2-seconds_GM431946152.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/las-mejores-paginas-de-hacks-de-roblox_GM431946152.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/moonactive-coin-master_GM406889139.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/hack-app-robux_GM431946152.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/hack-my-game-xyz-coin-master_GM406889139.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/static-moonactive-net-rewards_GM406889139.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/lukignton-international-airport-free-roblox_GM431946152.pdfIn PDF document text
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/coin-master-for-pc-free-download_GM406889139.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_off0000325c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x325C 23052 bytes
SHA-256: 6e42753659ccb9a640d2045b1e54b690e0484226eba36727c24730c498034a0f
font_01_sfnt_off00006645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6645 18168 bytes
SHA-256: b084d0e2e86f47cdd64d82d1d6e6bdcefc655448caf01d999206dcd8136a3bd2