Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e79c9b4e5c247cf…

MALICIOUS

PDF

48.8 KB Created: 2021-06-09 03:12:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a432ff38316f1427137cf346a8b390d4 SHA-1: c9cf39319d229edcd5d11a2b54ee9620b24ace7b SHA-256: 9e79c9b4e5c247cf366ab0d69db25510ac33afd9c9d44e1da561166164ee2f9f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that form a link farm, likely intended to drive traffic to malicious or scam-related content. The ML classifier and PDF heuristics strongly indicate malicious intent, with the document body and extracted URLs pointing towards lures for game hacks and generators. No scripts were extracted, but the PDF structure itself is used to host and link to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/roblox-hack-swordbust-game-hack PDF link annotation
    • http://ff-klaffenbach.de/images/make-your-own-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/offers-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/how-to-cheat-in-roblox-bee-swarm-simulator_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/how-to-get-free-robux-earnrobuxzone_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/robux-free-c_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/hack-coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/coin-master-gift-link_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/roblox-hack-one-piece-millennium_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/mcpe-hack-client_GM479516143.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/coin-master-free-coins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/what-is-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000505e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x505E 28100 bytes
SHA-256: 56b88b07c6ed602ad6c264f229fbbaa1eab92c9f89120df94c7c4f605dc9506b
font_01_sfnt_off00009071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9071 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off00009a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A33 18764 bytes
SHA-256: 28b99d5681f0e455cf4a41dd9e010c862f093b9fa7e9f603121f8df99b394e5b

Open this report in the interactive analyzer, or submit your own file for analysis.