Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a927eb6788ea9d…

MALICIOUS

PDF

33.9 KB Created: 2021-07-05 13:56:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c9f15e80f57fd0f55f84f9eebe829324 SHA-1: df15564e4a59ec935d849c43a029069ac372a4ea SHA-256: a4a927eb6788ea9de3ecc3034998ff5fe853b668c636bc0a08ebb7486dd8af47
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 0.9980

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 http://netcdn.tw/app/431946152/black-free-tshirt-template-roblox-game-hack PDF link annotation
    • http://lib.vipklh.ru/repository/one-punch-man-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-bee-swarm-simulator-hack-download_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/websites-where-you-can-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-in-roblox-without-builders-club_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/archery-master-3d-coins-hack_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-hack-generator-robux-gratuit_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-jailbreak-2021-btools-hack_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-cheat-engine-hacks-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-hack-into-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-hack-bots_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/hitbox-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/fun-roblox-games-to-cheat-on_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/december-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-hack-twitter_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-and-builders-club-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
font_00_sfnt_off00002da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DA6 21880 bytes
SHA-256: 0bb8bf21840e4ed16a6957f03624f78eae11f6fe40dad45ddcf7d5f115aaa0e1
font_01_sfnt_off00005dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEA 19648 bytes
SHA-256: 065572c8381bd137dd2648a0b8eb5b0bf50b7f713b27a0f7c91f3aeb01ac6236

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