Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e27f76f16618d1…

MALICIOUS

PDF

46.6 KB Created: 2021-06-03 15:21:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d9498308a309b0cc74b3197ef211217f SHA-1: a9b12ec627f356df5301ea909457072976b46325 SHA-256: f4e27f76f16618d1a7a7ca654615827cc5cda199c05eb8b08f5cf8ac5a91b44e
160 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a game hack redirector lure, pointing to a URL that is known to host malicious content. The document body and embedded artifacts are heavily obfuscated, but the primary lure is clear. The ML classifier also strongly flagged this PDF as malicious.

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-robux-game-hack In PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/roblox-hax_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/hack-para-coin-master-sin-verification_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-hack-spins-game-download_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/robuxglobalcom-no-verification_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/minecraft-windows-free_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-hack-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/if-i-uninstall-minecraft-can-i-reinstall-it-for-free_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-private-server-roblox_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-reddit_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050ce.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50CE 29772 bytes
SHA-256: bc3ce0de97a34946c378c4463626cc7ce24482f6c9ef1f04feec183bcdac864d
font_01_sfnt_off000094ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94EA 17852 bytes
SHA-256: fa3705be5ee6565d64fcba6f9827690fa2c8bb031b8e73c4196ce8f5ba2d7c1a

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