Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb2a63b9755011f…

MALICIOUS

PDF

41.8 KB Created: 2021-05-11 02:05:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 552f8a82a7711d7d72d8edd3fec8cbab SHA-1: aa153e120fd837c00493cdec39f12daf6ca2cfa3 SHA-256: cbb2a63b9755011fa26ca3387a29742c17b015c91c209b9dc6cf9890337fef86
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • 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/how-to-get-free-spins-in-coin-master-game-hack PDF link annotation
    • http://artindex.pro/images/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://artindex.pro/images/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://artindex.pro/images/get-me-free-robux_GM431946152.pdfIn PDF document text
    • http://artindex.pro/images/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://artindex.pro/images/coin-master-free-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://artindex.pro/images/hack-the-coin-master_GM406889139.pdfIn PDF document text
    • http://artindex.pro/images/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://artindex.pro/images/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://artindex.pro/images/free-spins-coin-master-april-2021_GM406889139.pdfIn PDF document text
    • http://artindex.pro/images/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://artindex.pro/images/coin-master-hack-injection_GM406889139.pdfIn PDF document text
    • http://artindex.pro/images/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://artindex.pro/images/roblox-free-items-glitch_GM431946152.pdfIn PDF document text
    • http://artindex.pro/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://artindex.pro/images/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://artindex.pro/images/hack-coin-master-apk-358_GM406889139.pdfIn PDF document text
    • http://artindex.pro/images/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://artindex.pro/images/free-robux-pin-codes_GM431946152.pdfIn PDF document text
    • http://artindex.pro/images/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • http://artindex.pro/images/coin-master-free-spins-link-ios_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_off00004810.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4810 25380 bytes
SHA-256: 5632bb5bf1c8c52e2922208e5ac51dc737d6d43eaa8dd0817db74c1176083641
font_01_sfnt_off000081d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81D2 18052 bytes
SHA-256: 52b27d49d658c5dd219fe1685a79a71966a386845fdc62a41335e5719e4d5001

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