Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a92e736d079aba…

MALICIOUS

PDF

47.9 KB Created: 2021-06-04 03:39:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a042b7682d5c82f1238674be20707829 SHA-1: 10a5dd7a9475e23a9a805660be1352bfbb590215 SHA-256: a9a92e736d079abad2e736cf5a2b9638ca0eae4e0c4994a31289efc24d06adea
162 Risk Score

Malware Insights

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

The PDF contains numerous links to websites offering game hacks and free in-game currency, indicating a lure for users to visit potentially malicious sites. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm designed to redirect users. While no scripts were directly extracted, the PDF structure and embedded links suggest a workflow that likely involves exploiting user interest in free game items to deliver a secondary payload or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

Heuristics 6

  • 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.
  • 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 https://netcdn.online/app/406889139/freegames911com-coinmastertipsandcheats2021freecoinsandspins-game-hack PDF link annotation
    • http://library.futureuniversity.com/repository/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-rare-cards_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-roblox-followers_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-spins-coin-master-without-survey_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/www-robux-us_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-get-free-robux-2021_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_004_off0000548c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x548C 28788 bytes
SHA-256: 21f7000433ba14089db64c435f866625a08fc8464aa3e7cb79cce157f328a88d
font_01_sfnt_off000095f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95F9 19340 bytes
SHA-256: ab752c077329254f7c43d77d98e16486f3a713dc065ac717a3b4fd91723259e7

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