Malicious PDF — malware analysis report

Static analysis result for SHA-256 15326d6854d52786…

MALICIOUS

PDF

35.0 KB Created: 2021-07-04 08:35:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: cde42c45564dc179a0cab0f42792396c SHA-1: c7b9ce825b6162b1164805e49569969d85a7bacf SHA-256: 15326d6854d52786a1cbf5febbf8809842bd7f444d6233bb526aefe91e3e5534
160 Risk Score

Malware Insights

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

The PDF contains multiple links to redirector infrastructure, specifically promoting 'free generator' or 'game hack' lures. The primary redirector URL is http://netcdn.tw/app/431946152/free-robux-gift-card-codes-game-hack. This suggests the document is designed to trick users into visiting malicious sites, likely to download further malware or engage in scams. No scripts were extracted, but the embedded URLs and heuristic firings strongly indicate a malicious redirection and download 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/431946152/free-robux-gift-card-codes-game-hack In PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/coin-master-2021-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/robux-2021_GM431946152.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/free-links-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/how-to-get-free-snacks-on-coin-master_GM406889139.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/minecraft-xbox-360-free_GM479516143.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/roblox-free-pets_GM431946152.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/free-robux-place_GM431946152.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/oprewards-com-robux_GM431946152.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/microsoft-roblox-rewards_GM431946152.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/coin-master-root-hack_GM406889139.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/free-robux-now_GM431946152.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/free-realistic-minecraft-texture-packs_GM479516143.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_off00003318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3318 22000 bytes
SHA-256: 42437569f2c6ab0819070895230d34d2c2c241288f81f5ac5b10fead6c09bdfc
font_01_sfnt_off000063ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63AD 19112 bytes
SHA-256: a9b7dd84bf9e82aea66064645c2f0ef7c8831366a8baade96afcbb6aebc803c0