Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f23929db07f0fd6…

MALICIOUS

PDF

47.3 KB Created: 2021-06-13 23:36:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6cb2c1a2c982998eefd1f5773c222276 SHA-1: 76864baf54926ef3f76c3882f307d0036f47430f SHA-256: 2f23929db07f0fd64751a7818ed4abc562adfb3c967057b03c025b767511c07a
102 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs and a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating a large number of external links, many of which are SEO-optimized PDFs. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic suggests a lure to download content. The ML classifier also flagged the PDF as malicious with high confidence. These factors point to a malicious document likely used for traffic generation or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/hex-number-free-robux-game-hack
    • http://anna-art.in.ua/images/equillex-how-to-get-free-robux-and-builders-club_GM431946152.pdf
    • http://anna-art.in.ua/images/free-tiktok-fans-without-verification_GM835599320.pdf
    • http://anna-art.in.ua/images/free-robux-no-verification-or-survey_GM431946152.pdf
    • http://anna-art.in.ua/images/how-to-get-free-spins-on-coin-master_GM406889139.pdf
    • http://anna-art.in.ua/images/free-robux-kid-friendly-no-human-verification_GM431946152.pdf
    • http://anna-art.in.ua/images/coin-master-free-spins-link-today-haktuts_GM406889139.pdf
    • http://anna-art.in.ua/images/ways-to-get-free-robux-2021_GM431946152.pdf
    • http://anna-art.in.ua/images/how-to-hack-coin-master-game-without-root_GM406889139.pdf
    • http://anna-art.in.ua/images/coin-master-hack-free-spins_GM406889139.pdf
    • http://anna-art.in.ua/images/roblox-rape-hack_GM431946152.pdf
    • http://anna-art.in.ua/images/free-minecraft-mods-for-pc_GM479516143.pdf
    • http://anna-art.in.ua/images/hacks-to-get-free-robux_GM431946152.pdf
    • http://anna-art.in.ua/images/10-weird-scary-hacker-storys-roblox_GM431946152.pdf
    • http://anna-art.in.ua/images/rblx-city-free-robux_GM431946152.pdf
    • http://anna-art.in.ua/images/free-coin-coin-master_GM406889139.pdf
    • http://anna-art.in.ua/images/coin-master-hack-apk-ios_GM406889139.pdf
    • http://anna-art.in.ua/images/free-roblox-outfits-2021_GM431946152.pdf
    • http://anna-art.in.ua/images/how-to-get-free-25-robux_GM431946152.pdf
    • http://anna-art.in.ua/images/free-robux-just-enter-username-and-password_GM431946152.pdf
    • http://anna-art.in.ua/images/hack-spin-coin-master-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b07.bin
df0f4df502cddba2eef8ca88e2cb1ce032ed3e1f3268251c68f8326119e6e56d
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B07 27468 bytes
font_01_sfnt_off00008981.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
pdf-font-stream PDF embedded font (sfnt) at offset 0x8981 5696 bytes
font_02_sfnt_off00009693.bin
54bce023c44527bb6080f79bccc332d1b7674a6aff51300e3a1687b6dcdd6b76
pdf-font-stream PDF embedded font (sfnt) at offset 0x9693 18276 bytes