Malicious PDF — malware analysis report

Static analysis result for SHA-256 261d9049eb1e2a78…

MALICIOUS

PDF

34.5 KB Created: 2021-07-04 20:46:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a756705b0757d16bba7f55e8d509fb24 SHA-1: 206a5865c61d4bf0ab2dca2b74c200c55d105d80 SHA-256: 261d9049eb1e2a781cc398ea8bc07a8915b36d37d3e8afd5aa3de27d75557e3b
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game hacks and in-game currency to entice users into clicking malicious links. The document contains numerous links to redirectors and SEO link farms, including a primary link to 'netcdn.tw' which is flagged as malicious infrastructure. The presence of embedded URLs and the ML classifier's high confidence score indicate a deliberate attempt to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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/479516143/minecraft-free-online-game-hack In PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/comment-avour-un-cheat-sur-roblox_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/roblox-project-pokemon-dll-hack_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/top-5-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-daily-free-rewards_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-get-free-robux-without-human-verification-on-computer_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-free-spins-app-for-iphone_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-become-a-hacker-on-roblox-ipad_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/jhow-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/roblox-free-wings-edit-avatar_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-gfet-cheat-engine-to-work-with-roblox_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/roblox-highschool-2-hack-script-pastebin-money_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/roblox-hack-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/game-kit-roblox-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/da-hood-cheats-roblox_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/accounts-with-robux-free-rocash_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/kat-hack-roblox_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/freerobux-redeem_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_off00003374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3374 22608 bytes
SHA-256: a476a830c5b4a57713019499d2fa5a55c90e56ee25e086ea43e423250b1eef37
font_01_sfnt_off00006569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6569 17928 bytes
SHA-256: aabc457c6fa2ff1a57cb7517c3773770131e5bb15a40066da2bb934e749c82de

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