Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3b8217613c321b…

MALICIOUS

PDF

46.6 KB Created: 2021-06-03 09:09:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 68b497044c1eea9f03f9d209d24e8c6a SHA-1: e0ec077783efb6b6d9f5a7cf69fe42cf387ae7c7 SHA-256: 5c3b8217613c321b8bfab3d719b6827cb4d7d40cbc5c8632e823d35a67caaf06
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including one identified as a malicious redirector for 'robux-free-online-game-hack'. The document body, though heavily obfuscated, contains references to game hacks and free currency, aligning with the heuristic findings of a lure for game-related scams. The presence of embedded URLs and the nature of the lures suggest an attempt to direct users to potentially malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 4

  • 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.
  • 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.online/app/431946152/robux-free-online-game-hack In PDF document text
    • https://eagleeyebooks.com/ckfinder/userfiles/files/how-do-you-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://eagleeyebooks.com/ckfinder/userfiles/files/coin-master-free-spins-link-october-2021_GM406889139.pdfIn PDF document text
    • https://eagleeyebooks.com/ckfinder/userfiles/files/how-many-levels-are-in-coin-master_GM406889139.pdfIn PDF document text
    • https://eagleeyebooks.com/ckfinder/userfiles/files/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • https://eagleeyebooks.com/ckfinder/userfiles/files/robuxy-com-generator_GM431946152.pdfIn PDF document text
    • https://eagleeyebooks.com/ckfinder/userfiles/files/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • https://eagleeyebooks.com/ckfinder/userfiles/files/coin-master-fun-free-spins_GM406889139.pdfIn PDF document text
    • https://eagleeyebooks.com/ckfinder/userfiles/files/free-robux-today_GM431946152.pdfIn PDF document text
    • https://eagleeyebooks.com/ckfinder/userfiles/files/pokemon-go-free-100-iv-map_GM1094591345.pdfIn PDF document text
    • https://eagleeyebooks.com/ckfinder/userfiles/files/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://eagleeyebooks.com/ckfinder/userfiles/files/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • https://eagleeyebooks.com/ckfinder/userfiles/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://eagleeyebooks.com/ckfinder/userfiles/files/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://eagleeyebooks.com/ckfinder/userfiles/files/hack-minecraft_GM479516143.pdfIn PDF document text
    • https://eagleeyebooks.com/ckfinder/userfiles/files/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://eagleeyebooks.com/ckfinder/userfiles/files/coin-master-hack-with-facebook-login_GM406889139.pdfIn PDF document text
    • https://eagleeyebooks.com/ckfinder/userfiles/files/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • https://eagleeyebooks.com/ckfinder/userfiles/files/robux-earning-sites_GM431946152.pdfIn PDF document text
    • https://eagleeyebooks.com/ckfinder/userfiles/files/play-minecraft-online-free_GM479516143.pdfIn PDF document text
    • https://eagleeyebooks.com/ckfinder/userfiles/files/free-robux-com-real_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
stream_004_off000054bf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54BF 28680 bytes
SHA-256: 2139007ca206ad6c03d196120629fadf0f44ba18dd5cb1d31af50a873a518ee9
font_01_sfnt_off00009419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9419 18208 bytes
SHA-256: 9c6e6aa5efa9903ee4d2fc70532f13b8880c04837d913a4df075592e4b137fb6

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