Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f238e729d161f14…

MALICIOUS

PDF

46.6 KB Created: 2021-05-10 23:45:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a4b86d18cac36663e960c7ee329f4a54 SHA-1: b5a4ae94b41d9c45ff061e499775ca3ac87fc6c1 SHA-256: 3f238e729d161f14a488b39eb453b35f03328f2e9c2fc8ad56877d717361330b
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, many of which are structured as SEO-optimized links to other PDFs, suggesting a link farm designed to drive traffic to potentially malicious content. The presence of a download button lure and ML classification further support malicious intent. The primary URL points to a 'game hack', indicating a lure for potentially unwanted software or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.xyz/app/431946152/roblox-2021-game-hack
    • http://jenne-technik.de/images/coin-master-daily-rewards_GM406889139.pdf
    • http://jenne-technik.de/images/coin-master-card-collection-hack-2021_GM406889139.pdf
    • http://jenne-technik.de/images/claim-free-spins-coin-master_GM406889139.pdf
    • http://jenne-technik.de/images/coin-master-apk_GM406889139.pdf
    • http://jenne-technik.de/images/coin-master-free-spins-hack-without-human-verification_GM406889139.pdf
    • http://jenne-technik.de/images/coin-master-free-foxy-food_GM406889139.pdf
    • http://jenne-technik.de/images/coin-master-free-spin-today-2021_GM406889139.pdf
    • http://jenne-technik.de/images/minecraft-pocket-edition-free-download_GM479516143.pdf
    • http://jenne-technik.de/images/how-to-get-free-robux-not-a-scam_GM431946152.pdf
    • http://jenne-technik.de/images/how-to-get-free-spins-on-coin-master-without-verification_GM406889139.pdf
    • http://jenne-technik.de/images/robux-free-online_GM431946152.pdf
    • http://jenne-technik.de/images/robux-redeem_GM431946152.pdf
    • http://jenne-technik.de/images/blogspot-free-spins-coin-master_GM406889139.pdf
    • http://jenne-technik.de/images/how-to-play-coin-master_GM406889139.pdf
    • http://jenne-technik.de/images/free-coin-master-spins-no-verification_GM406889139.pdf
    • http://jenne-technik.de/images/free-robux-no-verification-required_GM431946152.pdf
    • http://jenne-technik.de/images/unlimited-free-spins-coin-master_GM406889139.pdf
    • http://jenne-technik.de/images/how-to-hack-roblox-passwords_GM431946152.pdf
    • http://jenne-technik.de/images/free-robux-without-doing-anything_GM431946152.pdf
    • http://jenne-technik.de/images/how-to-get-free-food-for-foxy-in-coin-master_GM406889139.pdf
    • https://krnl.rocks
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049fe.bin
469f6e9be1e090bd6e858bb2834b582cf2812f51628cb9c5215fdc8cd29ce639
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49FE 31884 bytes
font_01_sfnt_off00009436.bin
6cca9372861d076cf8d3c2867e7e5d9b17d028f57adcd6414208106954a37e6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9436 18184 bytes