Malicious PDF — malware analysis report

Static analysis result for SHA-256 74281c64d0377cfd…

MALICIOUS

PDF

34.8 KB Created: 2021-07-06 12:13:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 2784cfa50764370d3ebc7d843f3862f5 SHA-1: 7b01640db73df4695f55a16b1db9650d11023b0f SHA-256: 74281c64d0377cfd65440bff63fc37e4092fd23b7ed8b638f274c0a380c1dd23
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, disguised as generators for popular games. The primary lure is 'free pet food coin master game hack', which directs to http://netcdn.tw/app/406889139/free-pet-food-coin-master-game-hack. This indicates a phishing or scam attempt to redirect users to potentially malicious websites. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/406889139/free-pet-food-coin-master-game-hack In PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-free-gamepass-on-horse-world-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-jailbreak-how-to-get-free-skins_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-hack-gui-download-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-roblox-card-codes-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-character-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-cheat-engine-scripts-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/i-want-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-movement-tool-roblox-hotkey_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/fly-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/skywars-free-vip-server-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/minecraft-pe_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/minecraft-free-download_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-hacks-download-2021-with-virustotal_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-hack-quora_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/300-daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-robux-generator-2021-real_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/script-hack-robox-robux_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
stream_002_off00002faf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FAF 23576 bytes
SHA-256: 473a7bb6d594d7ba471bea4f4cf0251b692bcb9656281fe020c8aa583c3c2114
font_01_sfnt_off00006564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6564 18324 bytes
SHA-256: a7c92b5cd33abe01afb42c60a8dc822ff1d4f8d31c8a3da7d6ded022ad377780

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