Malicious PDF — malware analysis report

Static analysis result for SHA-256 e04917369de29da4…

MALICIOUS

PDF

34.6 KB Created: 2021-07-04 09:26:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f22e31728d89608a23fe813e39b73450 SHA-1: 194bc898a5a2de35a71efd1d03df9b94a660012a SHA-256: e04917369de29da46844994b5cd4b422592489b6b4edb978b1077b99ad037547
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure. The document body and extracted URLs suggest a lure related to free game currency or hacks, a common tactic for distributing malware. While no scripts were explicitly extracted, the PDF structure and link-based redirection indicate a high likelihood of a malicious workflow initiated by user interaction.

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/431946152/free-robux-only-username-game-hack In PDF document text
    • http://lib.uho.ac.id/library//repository/coinmasterfree_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-game-download-free_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-free-no_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-spins-twitter_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-collect-today-free-spin_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hacks-for-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-reward-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/minecraft-free-download-ipad_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-daily-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-coins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-lawsuit_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hack-coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-free-items-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_off000031d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31D9 21752 bytes
SHA-256: 8fddb888e1e6a8005f0ea358d7697c45ccedecc13b58d0e90646a7b91079e2d3
font_01_sfnt_off000061ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61CE 19228 bytes
SHA-256: 6dddefc2d48c7f37f50c1a6b710d30cd99cee34b64e744400aeeb56817a3b712

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