Malicious PDF — malware analysis report

Static analysis result for SHA-256 23cf7cca31df6439…

MALICIOUS

PDF

43.5 KB Created: 2021-05-14 09:38:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: bd84fb373e758a51190a78f4fafb330c SHA-1: f4759cc0ebd6e9989bdc81ca66d05150d5c9b954 SHA-256: 23cf7cca31df643927c647418cbefd3c5d34a0ea5959a807042fa30caafdc04e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's part of a link farm and uses game hack lures to attract users. It directs to a URL that appears to be a redirector for game-related exploits. The document body, though heavily obfuscated, contains references to 'Roblox Speed Hack' and a URL that aligns with the heuristic findings. The presence of embedded URLs and the nature of the lures suggest an attempt to drive traffic or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/431946152/roblox-speed-hack-game-hack PDF link annotation
    • https://www.sauvonsleclimat.org/images/coin-master-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/legit-coin-master-hack-october-2021_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/coin-master-100-spin_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/minecraft-realms-free-codes_GM479516143.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/coin-master-hack-download-ios_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/coin-master-hack-club_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/free-robux-earn_GM431946152.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/how-do-you-get-roebucks-for-free_GM431946152.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/how-to-get-free-robux-on-ipad_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_003_off00004acf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ACF 25788 bytes
SHA-256: 1de8c64d1530a7151becbd52c0098902090baed3581194b44d9b6d8205f900fd
font_01_sfnt_off000086f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86F4 18532 bytes
SHA-256: ecd25e1cae784267f5a646f1b70b1ce742945d3ce40e95dc5b3aacf46c412aa4

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