Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1711625d916040…

MALICIOUS

PDF

41.5 KB Created: 2021-05-14 03:38:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2ec2d9b72897f6164528a126f8aac2cc SHA-1: 716e1148368e2e3b0403ae2231699fd3f3bdde69 SHA-256: 1b1711625d916040e097471d53328ae891f6795ca617cc701b4062684dab4ea2
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a call-to-action phrase, strongly suggesting a lure for users to download or visit potentially malicious sites. The ML classifier also flagged this PDF as malicious with high confidence. The presence of links related to 'free Robux' and game cheats indicates a common social engineering tactic.

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/431946152/to-get-free-robux-game-hack
    • http://sfera-express.ru/images/minecraft-beta-free_GM479516143.pdf
    • http://sfera-express.ru/images/coin-master-level-4_GM406889139.pdf
    • http://sfera-express.ru/images/free-robux-no-human-verification-generator_GM431946152.pdf
    • http://sfera-express.ru/images/minecraft-servers-that-allow-hacks_GM479516143.pdf
    • http://sfera-express.ru/images/how-to-get-free-robux-codes-2021_GM431946152.pdf
    • http://sfera-express.ru/images/get-coin-master-cards-free_GM406889139.pdf
    • http://sfera-express.ru/images/free-robux-com-no-verification_GM431946152.pdf
    • http://sfera-express.ru/images/how-to-get-free-skins-in-roblox_GM431946152.pdf
    • http://sfera-express.ru/images/free-coins-coin-master_GM406889139.pdf
    • http://sfera-express.ru/images/free-robux-on-ipad_GM431946152.pdf
    • http://sfera-express.ru/images/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdf
    • http://sfera-express.ru/images/free-robux-only-username_GM431946152.pdf
    • http://sfera-express.ru/images/roblox-free-accessories_GM431946152.pdf
    • http://sfera-express.ru/images/coin-master-free-coins-and-spins-daily_GM406889139.pdf
    • http://sfera-express.ru/images/coin-master-hack-app-2021-download_GM406889139.pdf
    • http://sfera-express.ru/images/easiest-coin-master-hack_GM406889139.pdf
    • http://sfera-express.ru/images/coin-master-free-coins-and-spins-app_GM406889139.pdf
    • http://sfera-express.ru/images/free-robux-generator-without-verification_GM431946152.pdf
    • http://sfera-express.ru/images/www-roblox-robux_GM431946152.pdf
    • http://sfera-express.ru/images/hack-coin-master-apk-32-download_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000045d2.bin
8bf723b66e68d4c12830393c0b5217f9ae139c7c0ace01963574756c249a54a2		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x45D2 25516 bytes
font_01_sfnt_off0000800e.bin
5233d5aad1bcdd77905869674ceee15891b0fc77671f16174d37808cf9f58ee1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x800E 18120 bytes

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