Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4e20d4fd3dffbf…

MALICIOUS

PDF

35.1 KB Created: 2021-06-30 00:16:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 41b6b8053eb7d341d20ea34022d4f643 SHA-1: 720a902615fc870a12a4bd725453ea68f38f3ac4 SHA-256: ab4e20d4fd3dffbfa414e2e48cc878bb9f1e3fd5b865806fa282e44267406fa5
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 SEO-optimized to appear as legitimate resources for game cheats and free currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a tactic to drive traffic to potentially malicious sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/hack-rpg-simulator-roblox-game-hack
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/free-robux-meme_GM431946152.pdf
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/roblox-how-to-get-obc-for-free_GM431946152.pdf
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/free-spins-and-coins-coin-master-app_GM406889139.pdf
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/free-robux-generator-for-roblox-2021_GM431946152.pdf
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/daily-coin-master-free-spin-apk_GM406889139.pdf
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/coin-master-link-app_GM406889139.pdf
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/how-to-get-free-coins-in-coin-master_GM406889139.pdf
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/how-to-get-free-snacks-on-coin-master_GM406889139.pdf
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/roblox-free-robux-inspect_GM431946152.pdf
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/bloxawards-com-earn-free-robux_GM431946152.pdf
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/link-for-free-coins-in-coin-master_GM406889139.pdf
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/202100-free-spins-coin-master_GM406889139.pdf
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/tiktok-views-free_GM835599320.pdf
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/free-spins-on-coin-master-game_GM406889139.pdf
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/coin-master-free-spin-today_GM406889139.pdf
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/roblox-tix-generator_GM431946152.pdf
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/free-minecraft-codes_GM479516143.pdf
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/what-are-points-for-in-roblox_GM431946152.pdf
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-phone_GM431946152.pdf
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/free-robux-no-verification-or-survey-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031a1.bin
349ebc4863e04c49c275c9f07a776b4cca70a4db9b269735b38acf0ef97aa9f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x31A1 22224 bytes
font_01_sfnt_off00006309.bin
a54af21c97ff62910f4143969c76f42729e41b3a48dab8eb2679281b52d966d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6309 19456 bytes

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