Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff46b2c2f782ba7…

MALICIOUS

PDF

45.8 KB Created: 2021-05-17 08:39:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d50b74e8ad6193680f7f29a438b659fd SHA-1: 6a97345e96d74e0b1d024d7354658291266b1cdb SHA-256: fff46b2c2f782ba71b0e38e85c417e803b379e184f434d707416e78324e8d5c5
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one that redirects to known malicious infrastructure associated with game hacks and free generators. The document body, though heavily obfuscated, contains a URL matching the malicious redirector. The presence of numerous PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

Heuristics 5

  • 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.
  • 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-spins-free-2021-game-hack In PDF document text
    • http://galletta.com/images/how-to-setup-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://galletta.com/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://galletta.com/images/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://galletta.com/images/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://galletta.com/images/gameoffice-net-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://galletta.com/images/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://galletta.com/images/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://galletta.com/images/coin-master-free-coins-link-facebook_GM406889139.pdfIn PDF document text
    • http://galletta.com/images/cm-spin-link_GM406889139.pdfIn PDF document text
    • http://galletta.com/images/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://galletta.com/images/get-free-coin-master_GM406889139.pdfIn PDF document text
    • http://galletta.com/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://galletta.com/images/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://galletta.com/images/coin-master-32-mod-hack-unlimited_GM406889139.pdfIn PDF document text
    • http://galletta.com/images/real-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://galletta.com/images/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://galletta.com/images/roblox-controversy_GM431946152.pdfIn PDF document text
    • http://galletta.com/images/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://galletta.com/images/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://galletta.com/images/coin-master-spin-hack_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_off00004b0c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B0C 25164 bytes
SHA-256: 3062af7fef73d4bd2c9f458f56daf66119928c2dc5a4b76389e82f1db524b8dc
font_01_sfnt_off0000851f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x851F 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off00009049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9049 18288 bytes
SHA-256: 41f21d94c3c0473acc3506ca33b951da9505e1643d81a04a8bd875c9ca2f7515

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