Malicious PDF — malware analysis report

Static analysis result for SHA-256 856c72fa416c9795…

MALICIOUS

PDF

41.1 KB Created: 2021-05-16 21:32:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a62f3080e6b11d3fb6a06c80d4c6d62e SHA-1: 4feb5ad49749ccd18fcb3a761b9efa9212ebb8e6 SHA-256: 856c72fa416c9795412b59f12c95ee69ea64e6f6c7b7d3a120197ab84cbe0fd6
160 Risk Score

Malware Insights

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

This PDF file contains multiple embedded URLs that redirect to a known malicious domain, masquerading as a 'Coin Master Hack'. The document body, though partially corrupted, contains references to game hacks and URLs hosted on `briankellyforcongress.com`, suggesting a lure for users seeking cheats or exploits. The presence of PDF-specific malicious redirector heuristics indicates the file is designed to lead users to potentially harmful content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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.
  • 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/coin-master-hack-2021-game-hack In PDF document text
    • http://briankellyforcongress.com/images/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://briankellyforcongress.com/images/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://briankellyforcongress.com/images/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://briankellyforcongress.com/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://briankellyforcongress.com/images/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://briankellyforcongress.com/images/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://briankellyforcongress.com/images/girl-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://briankellyforcongress.com/images/fb-coin-master_GM406889139.pdfIn PDF document text
    • http://briankellyforcongress.com/images/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://briankellyforcongress.com/images/robux-free-online_GM431946152.pdfIn PDF document text
    • http://briankellyforcongress.com/images/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • http://briankellyforcongress.com/images/get-free-robux_GM431946152.pdfIn PDF document text
    • http://briankellyforcongress.com/images/minecraft-the-complete-handbook-collection_GM479516143.pdfIn PDF document text
    • http://briankellyforcongress.com/images/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • http://briankellyforcongress.com/images/minecraft-server-free-trial_GM479516143.pdfIn PDF document text
    • http://briankellyforcongress.com/images/pop-slots-free-vegas-casino-slots-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • http://briankellyforcongress.com/images/lazyblocks-com-robux_GM431946152.pdfIn PDF document text
    • http://briankellyforcongress.com/images/free-robux_GM431946152.pdfIn PDF document text
    • http://briankellyforcongress.com/images/robux-generator-that-works_GM431946152.pdfIn PDF document text
    • http://briankellyforcongress.com/images/fb-coin-master-hack_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_off000046bd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46BD 24456 bytes
SHA-256: c7481a28cb019b5a91ccb67bdb500980a845d61db3beffbb5d8508fa5e1ad7fc
font_01_sfnt_off00007ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA1 18116 bytes
SHA-256: 17974cef81917e5ef69542194afa433aff210173cc902887fbc2b56a9328dd03

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