Malicious PDF — malware analysis report

Static analysis result for SHA-256 515c1d2e7ca4a279…

MALICIOUS

PDF

44.6 KB Created: 2021-06-03 06:08:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1b94f61ab6d87ac29b310b5797d8022f SHA-1: cf9cfc8cceb86a89619af09f6496f063da94872a SHA-256: 515c1d2e7ca4a27990cff87f478a8662f57379b5886be0695f2be19d8f6d982e
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 0.9865

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.online/app/431946152/free-exploits-for-roblox-game-hack PDF link annotation
    • http://lib.vipklh.ru/repository/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-redeem-code-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spins-link-without-human-verification_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/robux-offers_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-hack-iosgods_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-game-download-free_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-hack-progamers_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-hack-init-roblox-hack-addrobux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-spin-in-coin-master_GM406889139.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_off0000519e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x519E 25640 bytes
SHA-256: 71889d2eb26943993932bc5c711c6cc1b7ba652ac4056a2e43fe1c376697db2c
font_01_sfnt_off00008ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA6 18348 bytes
SHA-256: 3eb1125b3232d06dc8927376afe50af41f8c0a9e23720a9da0c3984e77695e12

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