Malicious PDF — malware analysis report

Static analysis result for SHA-256 93df8b7c43ca4320…

MALICIOUS

PDF

34.3 KB Created: 2021-06-26 15:18:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 83db9b8b502042115381d1bd6f2ea8d5 SHA-1: b9b289784eaf6fc724abab3a84bde22c4f73f064 SHA-256: 93df8b7c43ca4320deb5c0e97f0a3599a596665a14955709b9b44730943c4461
142 Risk Score

Malware Insights

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

This PDF document employs a common lure of game hacks and free in-game currency to entice users. It contains a high density of external links, many pointing to other PDF files, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly supports the malicious verdict.

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.co/app/431946152/hack-in-roblox-2021-game-hack PDF link annotation
    • http://lib.vipklh.ru/repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-for-pc-free-download_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/play-games-for-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/my-account-got-hacked-roblox_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-money-for-roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-free-robux-2021-pc_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-bypass-roblox-cheat-engine-without-download_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-tracker_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/is-coin-master-free_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-easy-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-hack-version-ios_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-gain-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-fan-page-free-spins_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
font_00_sfnt_off0000309f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x309F 21868 bytes
SHA-256: 18c05dcc4d0f7af9aee3cf0d7276d9073af6cab6a838c0dbf31962cfe25401f3
font_01_sfnt_off000060dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60DC 19056 bytes
SHA-256: 35e52912b086b406d5c0eb53f0c2908e0e37364bdf48df360c4544274d0ebe85

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