Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea083376cb65a28…

MALICIOUS

PDF

34.6 KB Created: 2021-07-06 04:13:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a4e28242d48f4a87835af62a07e84097 SHA-1: 4cb992965af3ad5ef714599cc1f2c6395338cd56 SHA-256: 9ea083376cb65a28b861df269b0e0f1ddf468a0d4cd37292bd9ffe86c422f823
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one that redirects to malicious infrastructure, masquerading as a 'free generator / game hack'. The document body and embedded URLs suggest a lure for free game currency or hacks, consistent with phishing or scamming attempts. No scripts were extracted, but the presence of malicious redirectors and the lure indicate a high likelihood of a phishing or scam campaign.

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/431946152/free-robux-no-verify-game-hack In PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/money-hack-ultimate-driving-roblox-2021-april_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/minecraft-client_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-pet-food-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-do-you-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-hack-someones-roblox-account-on-phone_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/roblox-design-it-hack_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/robux-sign_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/minecraft-pe-apk_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-332-apk-free-download_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/roblox-free-giveaway-800-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-link_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_off00002fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FB1 22564 bytes
SHA-256: 157b438e44062b74c6cb01968735708a6023332e1c10d49c7fa19b45562abb13
font_01_sfnt_off000061d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61D2 19148 bytes
SHA-256: c82ca362f7929c521a15e373c099d5f63e765e94f5114feac3ee2b66231d0241

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