Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d551313a486cbf1…

MALICIOUS

PDF

41.9 KB Created: 2021-05-17 03:21:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0bcb01652cf0cfd6f92f32dda3471d4b SHA-1: 25e70e0da1fb1092db4d46b3281ece76eb99a018 SHA-256: 8d551313a486cbf14b4f18da9d1a2d6a202542774e5fb089ba284e484df1a0c1
102 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 other PDF files, suggesting a link farm or a method to distribute further malicious content. The document body and heuristics indicate a lure related to game hacks, specifically Minecraft and Coin Master, aiming to trick users into clicking malicious links. The ML classifier strongly flagged this PDF as malicious.

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/479516143/hacks-for-minecraft-bedrock-game-hack
    • https://gastroration.ru/images/coin-master-free-spin-ml_GM406889139.pdf
    • https://gastroration.ru/images/free-coin-spin-daily-link-net_GM406889139.pdf
    • https://gastroration.ru/images/coin-master-game-android-free-download_GM406889139.pdf
    • https://gastroration.ru/images/coin-master-free-spins-1-coin-master_GM406889139.pdf
    • https://gastroration.ru/images/free-spins-coin-master-hack-2021_GM406889139.pdf
    • https://gastroration.ru/images/village-4-coin-master_GM406889139.pdf
    • https://gastroration.ru/images/minecraft-esp_GM479516143.pdf
    • https://gastroration.ru/images/cheats-for-coin-master_GM406889139.pdf
    • https://gastroration.ru/images/coin-master-raid-hack_GM406889139.pdf
    • https://gastroration.ru/images/coin-master-hack-apk-2021_GM406889139.pdf
    • https://gastroration.ru/images/free-spins-coin-master-haktuts_GM406889139.pdf
    • https://gastroration.ru/images/how-many-levels-are-in-coin-master_GM406889139.pdf
    • https://gastroration.ru/images/how-to-get-free-cards-in-coin-master_GM406889139.pdf
    • https://gastroration.ru/images/codes-to-get-free-robux_GM431946152.pdf
    • https://gastroration.ru/images/free-minecraft-java-code_GM479516143.pdf
    • https://gastroration.ru/images/is-roblox-free-on-pc_GM431946152.pdf
    • https://gastroration.ru/images/coin-master-cheats-and-hacks_GM406889139.pdf
    • https://gastroration.ru/images/coin-master-hack-tool-for-pc_GM406889139.pdf
    • https://gastroration.ru/images/is-coin-master-hacks-safe_GM406889139.pdf
    • https://gastroration.ru/images/coin-master-free-spins-daily_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004891.bin
e1398efa7f6bec426d3c1fba769ad26e540f01225be490cb7549a575b224e5be
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4891 25032 bytes
font_01_sfnt_off00008189.bin
92f6e8526b02627b1408819f1618724de120737fe6927f0c4c019a746b3c5a34
pdf-font-stream PDF embedded font (sfnt) at offset 0x8189 18268 bytes