Malicious PDF — malware analysis report

Static analysis result for SHA-256 597af11e7550c3c5…

MALICIOUS

PDF

34.2 KB Created: 2021-07-03 11:33:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 301633833435d5cedf4180b0db19fb90 SHA-1: 2f5ac77b86ba87c06d6b3fcdb040dc554cb17657 SHA-256: 597af11e7550c3c56a9b706f7fa2a1b6c24642c2813fb5a3ce6a76e529981621
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically advertising 'free generator' and 'game hack' lures. The primary redirector URL, http://netcdn.tw/app/406889139/free-spins-coin-master-haktuts-game-hack, is flagged as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a common lure for downloading further malicious content or leading to phishing pages.

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-haktuts-game-hack In PDF document text
    • http://gts.edu.gh/library/repository/hack-xp-net-generators-coin-master_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-dinosaur-simulator-hack-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-hack-without-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/hack-build-a-boat-roblox_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-roblox-decal_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/girl-hair-roblox-free_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/best-way-to-get-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-hack-hawtsauce_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-spins-coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-free-robux-no-inspecting_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-cheat-to-get-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/minecraft-windows-10-key-free_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-things-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-on-robux-store_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-spins-cash_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/earn-free-robux-roblox-game_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-hotel-elephant-infinite-money-hack_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_off00002f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F5F 22744 bytes
SHA-256: 8bac6f078e16ca546d2bfe2f9bd991740cadd32dea28773f2667a6d287997915
font_01_sfnt_off00006250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6250 18484 bytes
SHA-256: f7b6576a3f9b0348374d3a5fd8e4bb71623a7ab150aa44cb754c73ac43401ac4

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