Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3ac7f859cdc933…

MALICIOUS

PDF

34.3 KB Created: 2021-07-03 11:26:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 53e46101a7a1ebc4b7e8976f4dfb1693 SHA-1: b494991fcb0713d265f0af6d887780e63109bc66 SHA-256: 3e3ac7f859cdc933099f12ab73c7ca52d0ecf63af927ebd12611602d78489d5e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to redirector infrastructure, specifically advertising 'free generator / game hack' content. The primary malicious URL identified is http://netcdn.tw/app/406889139/free-spins-coin-master-app-iphone-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a lure for users to click through to potentially malicious websites, likely for credential harvesting or malware delivery.

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-spins-coin-master-app-iphone-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/real-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-space-outpost-tycoon-script-hack-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-roblox-executor-no-key_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-attacks-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/kids-games-free-roblox-download_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/send-me-500-2021-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/robux-website_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-hair-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/como-hackear-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-make-clothes-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-daily-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-verification_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_off00003072.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3072 22752 bytes
SHA-256: f109697db520af1521da770c5bb1f052f99c47b5fbf831266affc95f9e6674a3
font_01_sfnt_off00006388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6388 18340 bytes
SHA-256: 5d3b7efe24fb7202b678ba95f2c20ee71961a530999bc5dc4afdd93f09e9708b