Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68ef71d083ba5ab…

MALICIOUS

PDF

34.6 KB Created: 2021-07-07 13:29:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 747cde9f15ed93d9d163c9378f208a6a SHA-1: 3488fc9d61ff7f64d385ee40281ac20f3123b2c0 SHA-256: f68ef71d083ba5ab7d22d26e01d36735083c06d09e99d25872a41f6677d1d6f2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including a critical one to a known malicious redirector infrastructure at http://netcdn.tw/app/479516143/minecraft-java-edition-free-download-game-hack. The document body and heuristics indicate a lure for game hacks or generators, suggesting the intent is to redirect users to potentially malicious sites for further exploitation or phishing. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict.

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-java-edition-free-download-game-hack In PDF document text
    • https://dentmate.com.tw/image/data/files/how-to-hack-coin-master-with-game-guardian_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/hacks-para-roblox-descargar-2021_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/assassin-roblox-hack-aimbot_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-spins-on-coin-masters_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-free-rewards-link_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/how-to-get-more-followers-on-tiktok-free_GM835599320.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/is-there-a-hack-for-roblox_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/how-to-hack-roblox-and-get-unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/how-to-get-minecraft-dungeons-for-free_GM479516143.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-tiktok-likes_GM835599320.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-roblox-passwords_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-mast-hacks_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-free-spins-link-31-march-2021_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-spins-in-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/who-tiktok-free-followers_GM835599320.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/pet-sim-online-hack-download-roblox_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/roblox-hack-trial_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/roblox-apocalypse-rising-2-cheats_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_off00003142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3142 22264 bytes
SHA-256: fa110db320add633022800301e9e70149fb5e233cdde2e75ec0855018cc077b7
font_01_sfnt_off000062b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62B7 18856 bytes
SHA-256: 8fbddb6c46886cca0158565b48b603f499ba597020719e0d36747ec5902bb2a9

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