Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b59deabd8afafd5…

MALICIOUS

PDF

33.9 KB Created: 2021-07-03 19:07:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 6f8069b5201b292a9cd37c34cbc4d10b SHA-1: 77b120ef692f814b62f7ab5cf4716d5ab73b8e81 SHA-256: 4b59deabd8afafd592d6a8aacb294a01e27cbfd0a3c8dbf51bd7138128668c88
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game hacks and currency to entice users to click on embedded links. The links lead to a redirector and a large number of external PDF files, suggesting a link farm or SEO poisoning tactic to drive traffic. The ML classifier strongly indicated maliciousness, and the presence of numerous external links points towards a phishing or scam campaign.

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/free-modded-minecraft-server-hosting-game-hack In PDF document text
    • http://lib.unar.ac.id//repository/games-like-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/unlimited-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/free-coins-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/free-coin-master-cards-link_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/free-robux-pins_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/free-minecraft-wallpaper_GM479516143.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/how-to-get-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/roblox-free-bc-2021_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/free-exploits-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/free-links-for-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
font_00_sfnt_off00003099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3099 22140 bytes
SHA-256: e53e2eab3d013b66c238a64fe732b72d9384e0ffaea0967875b339c0f4c4bcf6
font_01_sfnt_off0000618e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x618E 18284 bytes
SHA-256: 4ae19380f71872a59bca81a6826a2f1ac99dae3e110f9987d961b4518a9677d8

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