Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5211c69a2e9086d…

MALICIOUS

PDF

34.8 KB Created: 2021-06-19 08:50:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a9e3453f7a62c251f60b2e7bd9841066 SHA-1: 899b54c7f6475b8148ae33c0dcad56af3932c266 SHA-256: f5211c69a2e9086d6d871c2e9ebb84251968b9e025c8e937175e52a7b7d0b197
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that appear to be part of a link farm, designed to lure users into downloading game-related cheats and hacks. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs and a link farm heuristic indicates a high likelihood of malicious intent. No scripts were extracted from this sample, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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
  • 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 http://netcdn.co/app/431946152/bloxburg-roblox-free-game-hack PDF link annotation
    • http://firesafetyservices.biz/images/roblox-hole-in-the-wall-cheat_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-game-pack-with-google-play-coin-master_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/how-to-get-free-robux-kazok_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/roblox-jailbreak-hack-deutsch_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coin-master-free-coins--spins_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/how-to-hack-coin-master-using-es-filer_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-spins-and-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/how-too-hack-in-superhero-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/tiktok-like-bot-free_GM835599320.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://firesafetyservices.biz/images/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://firesafetyservices.biz/images/coin-master-free-spins-link-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_002_off00003066.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3066 23116 bytes
SHA-256: 01f6dee32b375ec8e70e3425f49f5ed43af8d433d44bafd0a0ce0ed81e1bf8d9
font_01_sfnt_off0000646a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x646A 18604 bytes
SHA-256: c597c4cb1aa39901bc1be3b0036a924f2761da9bbb88659baf9f4e9eb510776b

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