Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a39348828e2ed0…

MALICIOUS

PDF

34.5 KB Created: 2021-07-04 08:04:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 93241d7b607974a0a58f9e7b83bbee49 SHA-1: b69628c1933e2f93d023569a8bd3a96de0ec576c SHA-256: 04a39348828e2ed07ebed595f9cc6db6c7e05cd473c0fa3244776ed09c356cd6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links, including one to 'netcdn.tw', which is flagged as a malicious redirector. The document body and heuristics indicate a lure for free game hacks or generators, suggesting an attempt to trick users into visiting malicious sites. While no scripts were extracted, the presence of malicious redirectors and the lure mechanism strongly suggest a phishing or malware distribution attempt.

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/479516143/minecraft-windows-10-edition-free-game-hack In PDF document text
    • http://library.umla.ac.id/repository/free-robux-boi_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-redeem-card-pin-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/pokemon-go-free-walk-ios_GM1094591345.pdfIn PDF document text
    • http://library.umla.ac.id//repository/hack-coin-master-using-cheat-engine_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/roblox-skins-boy-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-daily-spin-link-app_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/hack-de-roblox-sin-descargar-nada_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-to-village-3-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-phantom-forces-hack-reddit_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/daily-coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/can-you-download-roblox-on-ps4-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-redvalk-code-roblox-news_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/get-viral-on-tiktok-free_GM835599320.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/earn-free-robux_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_off00003189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3189 22120 bytes
SHA-256: b86578e6b9e730e690d9ff4e5ebb26c0b556ac131bc1cf3a290ffecbb93c0e51
font_01_sfnt_off0000624f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x624F 18812 bytes
SHA-256: 90006a4b8e57a38eddadfbaa613c320342a6ca665e14a1c59acf48d7d1de43f2

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