Malicious PDF — malware analysis report

Static analysis result for SHA-256 570bc091fd8850c3…

MALICIOUS

PDF

44.7 KB Created: 2021-05-11 08:41:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7ea75a0eca9edf93bd7d2a54dba3d70b SHA-1: 9fad944be74afcbc2eaf2c96c04f8b7c613311d7 SHA-256: 570bc091fd8850c38c68fda84c6ae55caa164399532a03de15c75ee47db0ded2
142 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are presented as game hacks or generators. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' and the presence of URLs like 'roblox-free-clothes-hack-game-hack' strongly suggest a social engineering tactic to trick users into visiting potentially malicious sites. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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-free-clothes-hack-game-hack PDF link annotation
    • https://www.gymun.cz/images/minecraft-handbook_GM479516143.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/free-800-robux_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-how-to-get-japan-sushi-card-free_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-free-spins-generator-no-human-verification_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-hack-tool-generator_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/rbx-com_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-70-spin-link-today_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-400-spin-link-today_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-get-minecraft-for-free-on-iphone-2021_GM479516143.pdfIn PDF document text
    • https://www.gymun.cz/images/free-roblox-girl-hair-not-a-model_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/free-robux-real_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047db.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47DB 25020 bytes
SHA-256: f063519c081c84e06f88173b1a192a7e6e4357699e7defff9543a9a424699606
font_01_sfnt_off00008128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8128 2888 bytes
SHA-256: dcdd98ee8e25436a83587ccb4027347dd2c3fcec95f3413942edd4086125bcca
font_02_sfnt_off00008afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AFC 18616 bytes
SHA-256: 103feac3cc5aa8b61edffdeede0b2c422429be550018f77d71a4c0e7d6940ea7

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