Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9511d3acc3a9361…

MALICIOUS

PDF

35.3 KB Created: 2021-07-04 00:12:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 93d3c22839b80846bed6dfe5c4ad3e71 SHA-1: c846720037d32cbd536da74437dd4b83be92c164 SHA-256: b9511d3acc3a9361eca0c9ed2a32ee2142b5099b414c0f2a5d7cfd15093c938c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. The file 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

  • 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.
  • 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
  • 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/free-robux-codes-2021-game-hack PDF link annotation
    • http://africanearthgroup.com/uploads/files/files/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://www.africanearthgroup.com/uploads/files/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://www.africanearthgroup.com/uploads/files/files/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
    • http://www.africanearthgroup.com/uploads/files/files/como-descargar-hacks-para-roblox-sin-virus_GM431946152.pdfIn PDF document text
    • http://www.africanearthgroup.com/uploads/files/files/coin-master-free-spins-whatsapp-link_GM406889139.pdfIn PDF document text
    • http://africanearthgroup.com/uploads/files/files/roblox-new-lighting-gmae-free_GM431946152.pdfIn PDF document text
    • http://africanearthgroup.com/uploads/files/files/roblox-royale-high-school-hacks-de-todo_GM431946152.pdfIn PDF document text
    • http://africanearthgroup.com/uploads/files/files/hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://africanearthgroup.com/uploads/files/files/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://www.africanearthgroup.com/uploads/files/files/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://www.africanearthgroup.com/uploads/files/files/hack-roblox-mod-apk-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://www.africanearthgroup.com/uploads/files/files/coin-master-game-free-download_GM406889139.pdfIn PDF document text
    • http://africanearthgroup.com/uploads/files/files/hack-my-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.africanearthgroup.com/uploads/files/files/minecraft-reach-hack_GM479516143.pdfIn PDF document text
    • http://africanearthgroup.com/uploads/files/files/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • http://africanearthgroup.com/uploads/files/files/play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://www.africanearthgroup.com/uploads/files/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.africanearthgroup.com/uploads/files/files/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://africanearthgroup.com/uploads/files/files/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • http://www.africanearthgroup.com/uploads/files/files/ways-to-get-free-robux_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_off00003102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3102 23132 bytes
SHA-256: 1f2b7546a9f2de3428c3e05e2e0724be352e8602c851845438cf7d2876aef52d
font_01_sfnt_off00006409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6409 19292 bytes
SHA-256: a06e109f4742255b3e3bb25118cfd4c6c94882922bdfaa475a115917b157a644

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