Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f47eddbb387db6a…

MALICIOUS

PDF

44.6 KB Created: 2021-05-11 19:42:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ed9a58fd74129082c735a0ea8c2ecd78 SHA-1: 479c356ac2aef7fba9ec8e9fecb4d7d89adae349 SHA-256: 9f47eddbb387db6a2676df510fe6402a6f99fa6ab7c3a0d7d546d3f958760626
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites offering game hacks and free in-game currency, indicative of a phishing or scam lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to drive traffic to potentially malicious sites. The ML classifier also flagged the PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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.xyz/app/406889139/free-spin-in-coin-master-game-hack PDF link annotation
    • http://dialine.cz/images/game-give-free-robux_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/hack-coin-master-game-apk_GM406889139.pdfIn PDF document text
    • http://dialine.cz/images/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • http://dialine.cz/images/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/hack-coin-master-game_GM406889139.pdfIn PDF document text
    • http://dialine.cz/images/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdfIn PDF document text
    • http://dialine.cz/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://dialine.cz/images/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://dialine.cz/images/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • http://dialine.cz/images/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://dialine.cz/images/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://dialine.cz/images/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/coin-master-free-spins-bit-ly_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049eb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49EB 25012 bytes
SHA-256: 6fa7541b929b78a4563927445f72dd1903dccf837ae50d767ba029aec1693959
font_01_sfnt_off0000837a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x837A 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D2B 17884 bytes
SHA-256: d73da77b5a1bbc7a2b5b207bcae6a8efd78ccb1f3c8a04009520d94079973ddb

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