Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d15800c7150ec52…

MALICIOUS

PDF

46.1 KB Created: 2021-06-07 11:01:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0cc71fe22af4bc6018975bdd3f7809d0 SHA-1: cc873694b0541aeedc7f70e3fee7dfbce1a12067 SHA-256: 4d15800c7150ec52aa874f7c0ed04e28677f8bc7e9ae686da7b18f1c902748df
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 PDF files, many of which are hosted on a domain associated with SEO link farming. The document body and extracted URLs suggest a lure for game cheats and hacks, likely intended to lead users to download further malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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-wall-hack-cheat-engine-game-hack PDF link annotation
    • http://killebergsridsport.se/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/free-minecraft-java-edition-codes_GM479516143.pdfIn PDF document text
    • http://killebergsridsport.se/images/coin-master-hack-activegamer_GM406889139.pdfIn PDF document text
    • http://killebergsridsport.se/images/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/free-spins-coin-master-links-app_GM406889139.pdfIn PDF document text
    • http://killebergsridsport.se/images/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/how-to-get-free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://killebergsridsport.se/images/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • http://killebergsridsport.se/images/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://killebergsridsport.se/images/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/coin-master-free-spins-activegamer_GM406889139.pdfIn PDF document text
    • http://killebergsridsport.se/images/minecraft-client-download_GM479516143.pdfIn PDF document text
    • http://killebergsridsport.se/images/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/gaming-cheatscom-roblox-us_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/facebook-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://killebergsridsport.se/images/how-to-play-coin-master_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_004_off0000520d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x520D 27632 bytes
SHA-256: 9c44179840af3860fda9b9c28bd2c83a04bf74134099000c761de472c2c431ef
font_01_sfnt_off00008f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F84 19056 bytes
SHA-256: c110c667c3ae69f388b39766d5e092c3ff254ba59e7d30a13fab5ac38388920b

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