Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2098f14fb0252b0…

MALICIOUS

PDF

45.6 KB Created: 2021-06-08 17:33:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1c304621e5d11a1579236ca085b85e3b SHA-1: ab1cffbfbf31b439c0288f3c9cec21cff2ec76d9 SHA-256: b2098f14fb0252b07cebebe5f9d4d671c7ac75df2b80cdd95918c39114ec4f87
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/free-demon-slayer-anime-roblox-clothes-game-hack PDF link annotation
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/when-was-minecraft-free_GM479516143.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/ear-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/coin-master-3rd-village-free-2021-gift-card_GM406889139.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/coin-master-hack-ios-reddit_GM406889139.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/is-minecraft-free_GM479516143.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/get-free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/roblox-rules_GM431946152.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/is-there-an-actual-hack-that-work-for-coin-master_GM406889139.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/free-minecraft-hosting-24-7_GM479516143.pdfIn PDF document text
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/minecraft-for-ipad-free_GM479516143.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_004_off00005259.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5259 25812 bytes
SHA-256: a4d8d6f50082f71846c6d11d2e4cabebb99361c7b04d45c446f34d179d69d4ce
font_01_sfnt_off00008d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D45 19176 bytes
SHA-256: 84aefbbeeea49f2a71b146ec236bcf5a0c3a925bb42d1e21409ed288cf4ad11b

Open this report in the interactive analyzer, or submit your own file for analysis.