Malicious PDF — malware analysis report

Static analysis result for SHA-256 370138a6b993e619…

MALICIOUS

PDF

43.1 KB Created: 2021-05-19 12:28:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 488b7b97e8b6884bc342882d639525b3 SHA-1: 3d66058c3c4d3aef1799bfc980d1a0f6b985e627 SHA-256: 370138a6b993e619c3fdfae590543892d1a9b0c18b60b4ce2de7fd9127d7fd4c
82 Risk Score

Malware Insights

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

The PDF contains a high-confidence heuristic firing for a game hack lure, directing users to a suspicious URL. The document body and embedded URLs reinforce this theme, suggesting a social engineering tactic to trick users into visiting a potentially malicious site. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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/406889139/coin-master-hack-ios-jailbreak-game-hack PDF link annotation
    • https://www.gymun.cz/images/202100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/free-robux_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.gymun.cz/images/2021-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/roblox-t-shirt-free_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/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-app-hack_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • https://www.gymun.cz/images/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/minecraft-com-free_GM479516143.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/roblox-games-that-give-you-free-robux_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_off00004881.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4881 27336 bytes
SHA-256: 33aa39e397169062d409f81c00c008733d207f4b436be2f26d2a974609e2b06a
font_01_sfnt_off000086ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86AE 18112 bytes
SHA-256: 1b0308d5ac0dfb41a556ba6c26081d7047b70f811c924827bde711dbba141842

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