Malicious PDF — malware analysis report

Static analysis result for SHA-256 51910eab220358b1…

MALICIOUS

PDF

26.3 KB Created: 2021-06-07 00:50:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6a2e0fcaa3d76da5c607269175e06b9d SHA-1: 4d74f436ef82e107f72bd941bbb25b3a2d9996e2 SHA-256: 51910eab220358b1b4e14ccb74ef594c91c4c1d8dc08870cb4ec45ecae2a6778
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering game hacks and generators, identified as a common lure for scams and potentially malicious content. The heuristic firings confirm the presence of malicious redirector links and a lure related to game hacks. Although no scripts were explicitly extracted, the PDF structure itself facilitates the redirection, aligning with T1059.007 if JavaScript were involved in the redirection process, and T1566.001 as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 3

  • 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.
  • 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 https://netcdn.tw/app/431946152/are-robux-hack-legit-forums-game-hack In PDF document text
    • http://www.hlad.hr/files/lots-of-robux_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/roblox-shirt-template-free_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/free-robux-group_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://www.hlad.hr/files/can-i-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://www.hlad.hr/files/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/roblox-avatar-free_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://www.hlad.hr/files/free-minecraft-for-kids_GM479516143.pdfIn PDF document text
    • http://www.hlad.hr/files/need-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.hlad.hr/files/pubg-uc-free-online_GM1330123889.pdfIn PDF document text
    • http://www.hlad.hr/files/coin-master-apk-mod_GM406889139.pdfIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004cc7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CC7 10013 bytes
SHA-256: b9936a2da1c3b5bd705b3d7866d6c6bfe5d248e5b35cab88ac576a845b5bcb01