Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b80617b29a6a770…

MALICIOUS

PDF

42.4 KB Created: 2021-05-10 21:03:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 184dff19def0a357b5bb28082c6d2c99 SHA-1: 8718ffaa4c6c6d5a19620790493a54703ba4e5da SHA-256: 3b80617b29a6a770ac40a69f59f66e0c0cb55a4751929a304201cd723a2c57bb
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirectors and a link farm, masquerading as game hacks and generators. The document body, though partially corrupted, contains references to 'free spin' and 'coin master game hack', aligning with the heuristic findings. The embedded links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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.
  • 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/406889139/free-spin-and-daily-news-coin-master-game-hack In PDF document text
    • http://dialine.cz/images/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/facebook-coin-master_GM406889139.pdfIn PDF document text
    • http://dialine.cz/images/coin-master-free-spins-link-download-apk_GM406889139.pdfIn PDF document text
    • http://dialine.cz/images/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • http://dialine.cz/images/free-hair-roblox_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://dialine.cz/images/free-robux-no-human-verify_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_GM406889139.pdfIn PDF document text
    • http://dialine.cz/images/coin-master-hack-game-download-mod-apk_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-pc-free_GM479516143.pdfIn PDF document text
    • http://dialine.cz/images/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/coin-master-free-spins-and-coins-group_GM406889139.pdfIn PDF document text
    • http://dialine.cz/images/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://dialine.cz/images/coin-master-free-spins-bit-ly_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-coins-on-coin-master_GM406889139.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_off00004a38.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A38 24356 bytes
SHA-256: 718b84faef9e0498042a43d9e40219b6fbd791a8a1756ab054cb98bb877d48fd
font_01_sfnt_off00008212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8212 18648 bytes
SHA-256: 1b97510549e3d8fe11dfd7453b1479af326f6ce77077d5a4dbd4033950bc4681

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