Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f84503995f3f0b…

MALICIOUS

PDF

48.4 KB Created: 2021-06-07 13:51:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ed01780aead03495c75dd97b0e6aa781 SHA-1: aaebda78ed70aee41f1f6fe5d51abb0c64498f88 SHA-256: 58f84503995f3f0bd82920c01ab5ae819ae76f38bfc7d78444b3dcacbb82413a
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF links. The document body and extracted URLs suggest a lure related to game hacks and in-game currency, indicating a phishing or scam attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9861

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/how-to-do-money-hack-roblox-game-hack
    • http://altc.de/images/daily-free-spins-on-coin-master_GM406889139.pdf
    • http://altc.de/images/minecraft-images-free_GM479516143.pdf
    • http://altc.de/images/coin-master-free-cards-link_GM406889139.pdf
    • http://altc.de/images/how-do-you-get-free-robux_GM431946152.pdf
    • http://altc.de/images/easy-coin-master-hack_GM406889139.pdf
    • http://altc.de/images/free-robux-2021-april_GM431946152.pdf
    • http://altc.de/images/coin-master-hack-online-pc_GM406889139.pdf
    • http://altc.de/images/coin-master-free-coins-link_GM406889139.pdf
    • http://altc.de/images/how-to-change-name-in-roblox-for-free-2021_GM431946152.pdf
    • http://altc.de/images/minecraft-education-free_GM479516143.pdf
    • http://altc.de/images/free-robux-generator-no-verification-2021_GM431946152.pdf
    • http://altc.de/images/robux-cheat_GM431946152.pdf
    • http://altc.de/images/mosttechs-coin-master-free-spins_GM406889139.pdf
    • http://altc.de/images/how-to-get-1-million-robux-for-free-2021_GM431946152.pdf
    • http://altc.de/images/tiktok-free-view-iphone-6s_GM835599320.pdf
    • http://altc.de/images/how-to-get-minecraft-pe-for-free_GM479516143.pdf
    • http://altc.de/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdf
    • http://altc.de/images/coin-master-daily_GM406889139.pdf
    • http://altc.de/images/coin-master-free-spins-link-2021_GM406889139.pdf
    • http://altc.de/images/robux-generators-that-actually-work_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051db.bin
86ea95f3908b6fc3dd82a2c3e7afdbcb315d1cfbb754e11843f8838f806e4064		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51DB 29960 bytes
font_01_sfnt_off000098f5.bin
7af42ecec050c17bc5798795b0f368835892b6a14bbd03859489c5fe688dadcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98F5 18892 bytes

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