Malicious PDF — malware analysis report

Static analysis result for SHA-256 86518342c61a60dc…

MALICIOUS

PDF

44.4 KB Created: 2021-05-14 02:31:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 78b64ed7869fb51f669cecff3afddb88 SHA-1: 37af53c617bbae3c30494685089e5b0c4047ede8 SHA-256: 86518342c61a60dc0aa1f4c98780a29c9cd9646b30204d8606d3b9dc232006f3
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and hosts related to 'free generator' and 'game hack' lures, indicating a phishing or scam attempt. The document body, though partially corrupted, contains references to these lures and embedded URLs. The presence of these links strongly suggests the document is designed to redirect users to potentially harmful websites, likely for credential harvesting or malware distribution.

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 https://netcdn.xyz/app/431946152/how-do-you-get-free-robux-without-doing-anything-game-hack In PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/coin-master-free-fire_GM406889139.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/how-to-get-free-admin-in-roblox_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/coin-master-hacks-that-work_GM406889139.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/coin-master-50-spin-link_GM406889139.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/free-robux-come_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/roblox-com-hack_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/hack-minecraft_GM479516143.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/coin-master-hack-com_GM406889139.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/wurst-client-download_GM479516143.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/coin-master-hack-programmers_GM406889139.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/toolbox-for-minecraft-ios_GM479516143.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/hacks-roblox_GM431946152.pdfIn PDF document text
    • http://clinicamanila.com/ckfinder/userfiles/files/how-do-you-get-roebucks_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_003_off00004a54.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A54 26632 bytes
SHA-256: 3dc5cdca1306f31fde4ec59121a947ac0e54c428cbb33fccc39d3f9edd5e58b5
font_01_sfnt_off000087a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87A2 19564 bytes
SHA-256: f288fbb1ab92d6f8be6652009a81e99b9e02fb437604b8cefd24a0b2528ef73f

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