Malicious PDF — malware analysis report

Static analysis result for SHA-256 f09efa75c328c18e…

MALICIOUS

PDF

35.2 KB Created: 2021-07-04 13:01:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: efd295ea986fa4cf939339e8535c6ca6 SHA-1: e042c26c6693cfc32c4d7da438d907d5eecd60e4 SHA-256: f09efa75c328c18e0222901cd332220edab8ac34f31010b237beb53ab04831c6
142 Risk Score

Malware Insights

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

This PDF document is classified as malicious due to its extensive use of link farms and lures for game hacks and virtual currency generators. The document contains numerous embedded URLs pointing to sites that promise free Robux or Coin Master spins, a common tactic for phishing or malware distribution. The ML classifier strongly supports the malicious verdict, and the PDF structure indicates a deliberate attempt to create a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/free-robux-com-no-verification-game-hack PDF link annotation
    • http://ggmtc.net/userfiles/files/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/links-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/roblox-how-to-use-cheat-engine-62_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/coin-master-golden-card-hack_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/free-robux-pin-codes_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/how-to-get-free-robux-by-robux-king_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/universal-minecraft-converter-free_GM479516143.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/coin-master-free-spins-link-download-ios_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/5-free-robux_GM431946152.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
font_00_sfnt_off0000320a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x320A 22380 bytes
SHA-256: 6ee30db12fc992ce928dd7fd1186fc74631fb26ae4131f515ab033e856098ca8
font_01_sfnt_off000063c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63C3 19336 bytes
SHA-256: c813de002ff3dbe8c0a3897963b9aec5f795785f2e6b2d861bbfa4c347d96c2a

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