Malicious PDF — malware analysis report

Static analysis result for SHA-256 c30938bd9e4de91b…

MALICIOUS

PDF

34.8 KB Created: 2021-07-06 12:25:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d3d61e9e4d5dcdaaf1c3c818eb67ed07 SHA-1: f3ff681b20f85d514d3f834aab246fff4a61bf8c SHA-256: c30938bd9e4de91b95afaf717eed26c030e4a9c17f6eddf32dcd9d875d3003db
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector, designed to lure users into downloading potentially unwanted or malicious content related to game hacks. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL suggests a phishing or scam attempt. No scripts were extracted, but the document's structure and embedded URLs point to a social engineering attack.

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/406889139/free-coin-master-spins-hack-game-hack In PDF document text
    • http://digilib.uim.ac.id/repository/minecraft-xbox-one-free_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-hack-one-piece-grand-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/hack-roblox-jailbreak-projrct-alpha_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-minecraft-for-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-roblox-accounts-that-work-2021_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/minecraft-java-edition-free-download-for-android_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-game-hack-online_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-prison-life-hack-download-2021_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/hack-fly-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/fly-hack-roblox-download-working-2021_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-free-maps-download_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/ho9w-to-get-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
stream_002_off000030e1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30E1 23128 bytes
SHA-256: 548d1ba8f7b60e291b88a3ac7f283936243a90d6c8d88a3c9e0199d523e8d975
font_01_sfnt_off00006529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6529 18344 bytes
SHA-256: 4d0657ae61433a99d4c3f327acf405e508756c248fc53430885ddf01c25216ba

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