Malicious PDF — malware analysis report

Static analysis result for SHA-256 2681d8db564f77a9…

MALICIOUS

PDF

35.0 KB Created: 2021-07-03 15:01:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 0ffa9741fe55418b834731bd1a1d955c SHA-1: 8d7a179076a01cb4d876764f4e0c785b74041a6d SHA-256: 2681d8db564f77a9e3b832ade7e3f937d9d8afa0dc06bae153c7c381226811ac
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/406889139/coin-master-hack-apk-35-11-game-hack PDF link annotation
    • http://lib.fekon.untad.ac.id/repository/roblox-darkness-2-cheats_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-robux-free-download_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/minecraft-ps4-code-free_GM479516143.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/anti-hacker-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/roblox-medieval-warfare-reforged-hack-script_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-1-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-roblox-giftcards-not-used-100-80_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/what-do-roblox-points-do_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/mcpe-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-get-free-bc-and-robux_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/bl4z3-games-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/100-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-hack-online-pc_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/roblox-gba-hack_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-get-free-clothes-on-roblox-without-bc-2021_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-unlimited-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/roblox-weight-simulator-3-cheat-code-2021_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_off0000323d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x323D 22712 bytes
SHA-256: 31be1b048c5830594c340a27cfb77c692e10d133226ecba21942f79913ab53ad
font_01_sfnt_off00006503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6503 18592 bytes
SHA-256: 7f49051940b6b9efc6132f30ff89e7b8d09fd75ee36cd2478622d195921c531a