Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7a2eda85f39c57…

MALICIOUS

PDF

33.6 KB Created: 2021-07-06 01:23:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: fdd247b8ba03ec0136bf6d25317d9da4 SHA-1: 139c0e407445ba171334592ffb5cf7da479b5696 SHA-256: 5d7a2eda85f39c57dfe6aca36b9bff92f00a387e15469541687ffa69dad2ae34
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free Robux' and game hacks. The document body and embedded URLs strongly suggest a social engineering lure to trick users into visiting malicious sites. While no scripts were explicitly extracted, the nature of the links and the lure indicate a phishing or scam attempt, likely leading to further malware download or credential harvesting.

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/who-to-get-free-robux-game-hack In PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-hack-games-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/hacked-roblox-game_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-do-u-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-bubble-gum-simulator-cheats_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-a-group-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-shinobi-life-free-hack_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-hack-roblox-bee-swarm-simulator_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-roblox-clothes-app_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-freebies-hack-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-catalog-items-on-roblox-pastebin_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-bandana-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/boku-no-roblox-remastered-hack-auto-farm_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-generator-for-kids_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_off00002d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D7B 21852 bytes
SHA-256: 6b79a4103d21b1fdb6a85fb1ee00a65d9726d4fdade3b9669bc4e0236a794ff2
font_01_sfnt_off00005da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA7 19184 bytes
SHA-256: 8d240f683c5a5d51cb605f4b06df9d271b22e3bf7dc4e657cba8cc5b4ea7a16b

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