Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f664c3723d3c62…

MALICIOUS

PDF

42.5 KB Created: 2021-05-16 11:56:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 09858fc59a8367abd16ad338b3a4ce78 SHA-1: d3565ff33d406993eb987273e9c0d78acc5dce26 SHA-256: 13f664c3723d3c62feaabef8609cc34583a9eb0bb52162c93e224fcca00166bb
142 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to what appear to be game hack or cheat sites, suggesting a lure for users to download potentially unwanted or malicious software. The presence of a fake CAPTCHA heuristic further supports the intent to trick users into performing an action, such as clicking a download link. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/archery-master-3d-unlimited-coins-hack-game-hack
    • https://lesegais.ru/images/minecraft-free-android_GM479516143.pdf
    • https://lesegais.ru/images/coin-master-free-spin-group_GM406889139.pdf
    • https://lesegais.ru/images/free-coin-master-spin-app_GM406889139.pdf
    • https://lesegais.ru/images/como-descargar-coin-master-hackeado_GM406889139.pdf
    • https://lesegais.ru/images/coin-master-attack-madness-hack_GM406889139.pdf
    • https://lesegais.ru/images/can-you-get-robux-for-free_GM431946152.pdf
    • https://lesegais.ru/images/coin-master-free-shield-link_GM406889139.pdf
    • https://lesegais.ru/images/how-to-hack-any-roblox-account_GM431946152.pdf
    • https://lesegais.ru/images/can-you-play-minecraft-for-free_GM479516143.pdf
    • https://lesegais.ru/images/roblox-free-clothes-codes_GM431946152.pdf
    • https://lesegais.ru/images/minecraft-wurst-client_GM479516143.pdf
    • https://lesegais.ru/images/minecraft-hacks-18-9_GM479516143.pdf
    • https://lesegais.ru/images/coin-master-free-link-spin_GM406889139.pdf
    • https://lesegais.ru/images/funbloxxyz-free-robux_GM431946152.pdf
    • https://lesegais.ru/images/easy-how-to-get-free-robux_GM431946152.pdf
    • https://lesegais.ru/images/coin-master-free-cards-link-2021-today_GM406889139.pdf
    • https://lesegais.ru/images/kuso-icu-roblox-hack_GM431946152.pdf
    • https://lesegais.ru/images/how-to-get-free-robux-hack-2021_GM431946152.pdf
    • https://lesegais.ru/images/coin-master-free-spins-link-today-hack_GM406889139.pdf
    • https://lesegais.ru/images/martian-lettuce-coin-master-free_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000048ae.bin
4da4106e5eb810b0088b317e5ec9933df16715ec22e96b0c82d70fe40253e951
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48AE 25148 bytes
font_01_sfnt_off000081fc.bin
68a1d49791257d9f2ad602f5d41fb7369be842eea3b9c5f87e4c238e71419427
pdf-font-stream PDF embedded font (sfnt) at offset 0x81FC 18928 bytes