Malicious PDF — malware analysis report

Static analysis result for SHA-256 654ccc17fc1e3d26…

MALICIOUS

PDF

45.4 KB Created: 2021-06-11 08:07:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 177eeb535b2fbd126a8f5946a8a54a64 SHA-1: 30b870651b8d72a46f04f5666da893862f70ef7b SHA-256: 654ccc17fc1e3d26037c1b550a52ee913eb7e0bd56eb2ce3f38dc5557f285b72
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to websites offering game hacks and cheats, such as 'robux-cheats-com-game-hack'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or redirection mechanism. The presence of these lures, combined with the ML classifier flagging the PDF as malicious, strongly suggests an attempt to direct users to potentially harmful sites, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/robux-cheats-com-game-hack PDF link annotation
    • http://aeridefense.com/image/data/files/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/lua-script-pour-hack-roblox_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/coin-master-mod-version-free-download-2021_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/2021-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/hack-a-game_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-roblox-gift-card-codes-2021-unused_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-role-in-coin-master_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/hack-client_GM479516143.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-robux-please_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/hack-coin-master-ios-download_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-hack-mcpe-master-coins_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_004_off000051d4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51D4 26744 bytes
SHA-256: 9d1270d838634021432094d17678165187232cde2749d598a226e07256a2a310
font_01_sfnt_off00008df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF4 18608 bytes
SHA-256: 4761829fa2d276774f90e381deae0602d835b6dde3cb619df9d68a8e7c1770f1

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