Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90c7678cf9bbfbf…

MALICIOUS

PDF

35.5 KB Created: 2021-07-07 14:25:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: f8ce5a33a6f0e8e282d2dd76b5b53cdd SHA-1: e50ef47be5e413dc50342011e541c7cbd03838c1 SHA-256: d90c7678cf9bbfbf0a796171d279493ce2861616d13b02ff86a61f087afd3ed1
180 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for linking to a known malicious redirector, specifically advertising a 'game hack' lure. The document body and embedded URLs reinforce this by pointing to sites offering free game currency and hacks, which is a common phishing tactic. While no scripts were directly extracted, the nature of the lure and the redirector suggests an attempt to lead the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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/coin-master-free-coins-link-2021-deutsch-game-hack In PDF document text
    • https://www.sarsen.net/uploads/files/files/apps-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/roblox-kat-hacks_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-tiktok-fans-and-likes_GM835599320.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-hack-your-friends-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-roblox-game-clones_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/roblox-hack-tool-for-robux_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/only-working-way-to-get-free-robux-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/roblox-jailbreak-free-lamborghini_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-hack-roblox-no-downloads-2021_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-get-robux-free-2021_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-cheat-on-bear-roblox_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-roblox-promo-codes-november-2021_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-minecraft-windows-10-account_GM479516143.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/como-hackear-robux-en-roblox_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/roblox-gift-card-free-codes_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_002_off00003198.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3198 23220 bytes
SHA-256: db98c303b2949057fec051018ab75ac422e44edf0e76164ecb34bccaf2632c39
font_01_sfnt_off000065f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65F9 19044 bytes
SHA-256: 2844f756ddbcc4a04a8e584fba3bd9ee643c4403cf9fe90d32670bab9c0c39f1

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