Malicious PDF — malware analysis report

Static analysis result for SHA-256 524b4c2b64f0429a…

MALICIOUS

PDF

42.0 KB Created: 2021-05-16 08:00:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f939408bca39c7a25f0ef560ded6aa2d SHA-1: 916d3071d5f034d9ec7b8a90a9184b50552a962a SHA-256: 524b4c2b64f0429ad79c65611f9cb9514c15a73d91fe5cd885e169ff37cfbb57
102 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are SEO-optimized and point to sites offering "free Robux" or "Coin Master spins". This indicates a link farm designed to attract users with game-related lures, likely leading to phishing or malware download pages. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/links-for-coin-master-free-spins-game-hack PDF link annotation
    • http://elektrofahrspass.de/images/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elektrofahrspass.de/images/how-to-get-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://elektrofahrspass.de/images/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://elektrofahrspass.de/images/minecraft-font-free_GM479516143.pdfIn PDF document text
    • http://elektrofahrspass.de/images/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://elektrofahrspass.de/images/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elektrofahrspass.de/images/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://elektrofahrspass.de/images/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://elektrofahrspass.de/images/village-3-coin-master_GM406889139.pdfIn PDF document text
    • http://elektrofahrspass.de/images/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://elektrofahrspass.de/images/mcpe-master-hack-unlimited-coins_GM406889139.pdfIn PDF document text
    • http://elektrofahrspass.de/images/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://elektrofahrspass.de/images/free-spins-for-coin-masters_GM406889139.pdfIn PDF document text
    • http://elektrofahrspass.de/images/earnrobux_GM431946152.pdfIn PDF document text
    • http://elektrofahrspass.de/images/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://elektrofahrspass.de/images/coin-master-cheat-codes_GM406889139.pdfIn PDF document text
    • http://elektrofahrspass.de/images/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://elektrofahrspass.de/images/coin-master-hack-apk-no-survey_GM406889139.pdfIn PDF document text
    • http://elektrofahrspass.de/images/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://elektrofahrspass.de/images/free-coin-master-spin-app_GM406889139.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_003_off00004a08.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A08 24624 bytes
SHA-256: 21414e6e7301d1f23a1948e25e582fe17759cdbabd1bc635bccaf52833255cf9
font_01_sfnt_off00008289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8289 18056 bytes
SHA-256: 5bd6e3cfe68b47e0b382d784f8bacc73234a270e4b46fb36b887714955dd385b

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