Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ffea997c2f839d…

MALICIOUS

PDF

34.9 KB Created: 2021-06-27 19:46:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a3d5f8090419efcf008bd68018ff10d0 SHA-1: bee3b0bbe218b30207a7c6a15b9574b0267aaddc SHA-256: 77ffea997c2f839deb8eee5d9926e1857f95c44b87e4a80becae16be9eea64c7
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document is designed to lure users into clicking on links related to game hacks and free currency generators. It employs a fake CAPTCHA mechanism to trick users into interacting with these malicious links, which likely lead to further compromise or scams. The document contains a large number of SEO-optimized links, suggesting a link farm or content-spinning operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/479516143/minecraft-svg-free-game-hack PDF link annotation
    • http://autoskola-scp.com/files/how-do-you-earn-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/redeem-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/ultimate-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/guest-666-roblox-hack_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/pink-paradigm-hack-created-by-lord-of-robux-explication_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-daily-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/roblox-studio-free-download_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/how-to-use-free-gamepass-scripts-in-roblox_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-group-roblox_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-game-hack-apk_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/how-can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://autoskola-scp.com/files/how-to-hack-a-roblox-account-easy_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_off000033c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33C7 22784 bytes
SHA-256: 26bf59eeb6429e87340edc219fef3bc071faa5c0e0d3a18d28345953af8278cd
font_01_sfnt_off000066f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66F1 17968 bytes
SHA-256: f82c060a5662ddcca675aec0cfac04b32032cde6baf3a8524f802f6fcb7e6d40

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