Malicious PDF — malware analysis report

Static analysis result for SHA-256 f255caaa3fd181ef…

MALICIOUS

PDF

45.5 KB Created: 2021-05-15 15:44:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 03a23e5006517ca3359bb2cc81e4756c SHA-1: 9148f98b0b4c6c4c40d8998df32d6bfdbe05b03d SHA-256: f255caaa3fd181efb72ecf8c039ef91249fd4100533ef06bf38dea9acd996fba
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links to external websites, many of which are structured as SEO-optimized links for game-related hacks and cheats. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs suggests a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains references to game hacks and the authoring application, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/406889139/8bp-hack-coin-master-game-hack
    • https://www.prodex-holz.cz/images/free-spin-coin-master-2021-link_GM406889139.pdf
    • https://www.prodex-holz.cz/images/free-minecraft-shaders_GM479516143.pdf
    • https://www.prodex-holz.cz/images/roblox-hack-app_GM431946152.pdf
    • https://www.prodex-holz.cz/images/minecraft-java-edition-free-trial_GM479516143.pdf
    • https://www.prodex-holz.cz/images/coin-master-twitter-free-spins_GM406889139.pdf
    • https://www.prodex-holz.cz/images/how-to-hack-coin-master-game-without-verification_GM406889139.pdf
    • https://www.prodex-holz.cz/images/microsoft-free-robux_GM431946152.pdf
    • https://www.prodex-holz.cz/images/free-spin-in-coin-master_GM406889139.pdf
    • https://www.prodex-holz.cz/images/roblox-tix-generator_GM431946152.pdf
    • https://www.prodex-holz.cz/images/coin-master-cards-free-cards_GM406889139.pdf
    • https://www.prodex-holz.cz/images/how-to-get-infinite-robux_GM431946152.pdf
    • https://www.prodex-holz.cz/images/free-spin-link-coin-master_GM406889139.pdf
    • https://www.prodex-holz.cz/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • https://www.prodex-holz.cz/images/coin-master-hack-using-cheat-engine_GM406889139.pdf
    • https://www.prodex-holz.cz/images/robux-offer-wall_GM431946152.pdf
    • https://www.prodex-holz.cz/images/coin-master-free-spins-coins_GM406889139.pdf
    • https://www.prodex-holz.cz/images/free-rare-cards-for-coin-master_GM406889139.pdf
    • https://www.prodex-holz.cz/images/daily-free-spins-coin-master_GM406889139.pdf
    • https://www.prodex-holz.cz/images/coin-master-free-spins-link-blogspot_GM406889139.pdf
    • https://www.prodex-holz.cz/images/free-robux-no-survey_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b6d.bin
dedfd1795a90cc4e2c6b302906008a57f547fae5c4ca23af2cefd6879a958d66
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B6D 25208 bytes
font_01_sfnt_off000085c2.bin
96a70491b0783ad8c6fc9b11a18f021aa22c69ac41ee4499b781d16a1b99b689
pdf-font-stream PDF embedded font (sfnt) at offset 0x85C2 2820 bytes
font_02_sfnt_off00008f63.bin
40ee1887dd31b0862b85694c1b9e7d14e4b08e6d7c2645c8853cb2866e35e1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F63 18260 bytes