Malicious PDF — malware analysis report

Static analysis result for SHA-256 73df6afabb23c681…

MALICIOUS

PDF

42.3 KB Created: 2021-05-17 21:04:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c90933a5e2ab7220a73ebab4095c0a1b SHA-1: e5f46714d34d62755c4b2b0a51e08925ddb2f233 SHA-256: 73df6afabb23c681ffdfa9dbdd1064b77c61217327b30b3ae113119e75aa7891
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are presented as game hacks or cheats. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a link farm designed to drive traffic to potentially malicious content. The primary URL, 'https://netcdn.xyz/app/406889139/download-hack-coin-master-game-hack', is directly associated with a 'game hack' lure. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering tactic to trick users into downloading unwanted software or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/download-hack-coin-master-game-hack PDF link annotation
    • https://www.beritabali.com/new/public/ckfinder/userfiles/files/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • https://www.beritabali.com/new/public/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-iphone-2021_GM479516143.pdfIn PDF document text
    • https://www.beritabali.com/new/public/ckfinder/userfiles/files/how-to-change-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • https://www.beritabali.com/new/public/ckfinder/userfiles/files/roblox-free-items-2021_GM431946152.pdfIn PDF document text
    • https://www.beritabali.com/new/public/ckfinder/userfiles/files/prison-life-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://www.beritabali.com/new/public/ckfinder/userfiles/files/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • https://www.beritabali.com/new/public/ckfinder/userfiles/files/free-spins-and-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://www.beritabali.com/new/public/ckfinder/userfiles/files/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • https://www.beritabali.com/new/public/ckfinder/userfiles/files/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • https://www.beritabali.com/new/public/ckfinder/userfiles/files/free-spin-app-coin-master_GM406889139.pdfIn PDF document text
    • https://www.beritabali.com/new/public/ckfinder/userfiles/files/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.beritabali.com/new/public/ckfinder/userfiles/files/how-to-hack-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
    • https://www.beritabali.com/new/public/ckfinder/userfiles/files/earn-points-for-robux_GM431946152.pdfIn PDF document text
    • https://www.beritabali.com/new/public/ckfinder/userfiles/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.beritabali.com/new/public/ckfinder/userfiles/files/coin-master-hack-apk-35-8_GM406889139.pdfIn PDF document text
    • https://www.beritabali.com/new/public/ckfinder/userfiles/files/minecraft-xbox-one-edition-digital-code-free_GM479516143.pdfIn PDF document text
    • https://www.beritabali.com/new/public/ckfinder/userfiles/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.beritabali.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • https://www.beritabali.com/new/public/ckfinder/userfiles/files/free-spins-and-coins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://www.beritabali.com/new/public/ckfinder/userfiles/files/tower-of-hell-roblox-hack_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_off00004b71.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B71 24188 bytes
SHA-256: 218194db973ad1a39d9d51ab8d1bb1104c3712b85d8f6de76dffb20b336f0fbb
font_01_sfnt_off00008305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8305 18296 bytes
SHA-256: 014eb3bb80a3687b4d2f2309fc9b410fcca0ecdce13dd0dc67b7e2f0e819dc99