Malicious PDF — malware analysis report

Static analysis result for SHA-256 e251e9e21cc515b4…

MALICIOUS

PDF

34.2 KB Created: 2021-07-09 06:55:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 53891fde3d356c348979653814195674 SHA-1: ef896db64aae18f9923c5ac5ee2e6527cf9b2810 SHA-256: e251e9e21cc515b404b2f626d8e58de604885e6ae64a54471982c51697eedba9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one identified as a malicious redirector pointing to 'http://netcdn.tw/app/431946152/instantrobux-game-hack'. This infrastructure is associated with lures for game hacks and free generators, aiming to trick users into visiting potentially harmful sites. The presence of embedded URLs and a critical heuristic firing for malicious redirector links strongly suggests a phishing or scamming 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/instantrobux-game-hack In PDF document text
    • https://www.zagorjeadventureteam.hr/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.zagorjeadventureteam.hr/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.zagorjeadventureteam.hr/files/roblox-but_GM431946152.pdfIn PDF document text
    • https://www.zagorjeadventureteam.hr/files/roblox-free-wings_GM431946152.pdfIn PDF document text
    • http://zagorjeadventureteam.hr/files/roblox-cheats-proxy_GM431946152.pdfIn PDF document text
    • https://www.zagorjeadventureteam.hr/files/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • https://www.zagorjeadventureteam.hr/files/ww-roblox-com-cheat-in_GM431946152.pdfIn PDF document text
    • https://www.zagorjeadventureteam.hr/files/get-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.zagorjeadventureteam.hr/files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://zagorjeadventureteam.hr/files/robux-claimer_GM431946152.pdfIn PDF document text
    • http://zagorjeadventureteam.hr/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://www.zagorjeadventureteam.hr/files/how-to-hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • http://zagorjeadventureteam.hr/files/coin-master-card-collection-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.zagorjeadventureteam.hr/files/coin-master-hacks-no-surveys_GM406889139.pdfIn PDF document text
    • https://www.zagorjeadventureteam.hr/files/minecraft-free-games-no-download_GM479516143.pdfIn PDF document text
    • https://www.zagorjeadventureteam.hr/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://www.zagorjeadventureteam.hr/files/minecraft-story-mode-free_GM479516143.pdfIn PDF document text
    • http://zagorjeadventureteam.hr/files/pastebin-robux-free_GM431946152.pdfIn PDF document text
    • https://www.zagorjeadventureteam.hr/files/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.zagorjeadventureteam.hr/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FD4 22384 bytes
SHA-256: 42857eba144600f4dd565aa0450446bf0ec3c8510bd1b3129f92a0683b9a910a
font_01_sfnt_off000061b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61B7 18656 bytes
SHA-256: 5a13a4ba7d4aa3ba564163d7fd1f4e40de414e0c8b16d10ac9018e4301010f0d

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