Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91bbb9326719241…

MALICIOUS

PDF

32.7 KB Created: 2021-06-25 18:13:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a8d7b215d07006fa3b3eccb9a353d997 SHA-1: 9582032ad52027a8345e68fcccd2ec605e054d57 SHA-256: d91bbb93267192416f1018c70f0fe5f61f401c302a791d25c0fd032e610f5a53
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'free generators' and 'game hacks' for popular titles. The primary lure URL is http://netcdn.co/app/431946152/roblox-free-shirts-id-game-hack. While no scripts were extracted, the document's structure and embedded URLs strongly indicate a phishing or scam attempt designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.co/app/431946152/roblox-free-shirts-id-game-hack In PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-roblox-game-card-generator_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/without-pokemon-go-free-evolution_GM1094591345.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-pet-food-free_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/roblox-robux-hack-page_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/pokemon-go-free-move_GM1094591345.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/robux-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/is-minecraft-free-on-computer_GM479516143.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/how-to-get-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/how-to-earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coinmaster-free-cards_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-girl-clothes-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-attacks-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-printable-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-50-spin-link_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-shavaco-do-song-code-for-roblox_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_off00002a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A5B 21848 bytes
SHA-256: 0c6ac0397e154ec32caf3acc9145426befe5cc59097e20d836ac0866e2b8ba75
font_01_sfnt_off00005ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC0 19216 bytes
SHA-256: 8c76c47ed1a130b7b29031b7a03b30fae46519bbd34fb5b0c0991bbd723d06fe

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