Malicious PDF — malware analysis report

Static analysis result for SHA-256 77fab2c5a4072acb…

MALICIOUS

PDF

45.2 KB Created: 2021-06-02 06:31:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 79d5fd83a9d642d1c24bed6dbf1b6c21 SHA-1: 1555193276b2c5eb65869a5afe6c92afdeaccf07 SHA-256: 77fab2c5a4072acb6120e044857cad385ed393039d8cd5e00ba500d993d23270
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that link to external PDF files, many of which are SEO-optimized and appear to be part of a link farm. The primary URL suggests a lure for game hacks, and the presence of a "download button" heuristic further supports a malicious download attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9804

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/835599320/tiktok-for-free-game-hack
    • http://mklista.ru/images/coin-master-apk-hack-download_GM406889139.pdf
    • http://mklista.ru/images/coin-master-free-stars_GM406889139.pdf
    • http://mklista.ru/images/coin-master-free-in-app-purchases_GM406889139.pdf
    • http://mklista.ru/images/games-that-give-free-robux_GM431946152.pdf
    • http://mklista.ru/images/install-free-game-coin-master_GM406889139.pdf
    • http://mklista.ru/images/can-you-host-a-minecraft-server-for-free_GM479516143.pdf
    • http://mklista.ru/images/free-robux-websites-no-human-verification_GM431946152.pdf
    • http://mklista.ru/images/free-links-for-coin-master_GM406889139.pdf
    • http://mklista.ru/images/coin-master-download-hack-ios_GM406889139.pdf
    • http://mklista.ru/images/coin-master-free-daily-spins-link_GM406889139.pdf
    • http://mklista.ru/images/free-robux-hack-no-human-verification-or-survey_GM431946152.pdf
    • http://mklista.ru/images/daily-free-spins_GM406889139.pdf
    • http://mklista.ru/images/spin-link-coin-master_GM406889139.pdf
    • http://mklista.ru/images/robloxheroxyz-free-robux_GM431946152.pdf
    • http://mklista.ru/images/roblox-scam_GM431946152.pdf
    • http://mklista.ru/images/coin-master-free-spins-and-coins_GM406889139.pdf
    • http://mklista.ru/images/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdf
    • http://mklista.ru/images/free-robux-place_GM431946152.pdf
    • http://mklista.ru/images/how-to-hack-any-roblox-account_GM431946152.pdf
    • http://mklista.ru/images/coin-master-spin-blogspot_GM406889139.pdf
    • https://hackernoon.com/tiktok-free-fans
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004ab4.bin
6e9d64001fcd921677b2fcbc802256ed0a774867b380457e2ddbf6704492d752
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AB4 26080 bytes
font_01_sfnt_off00008681.bin
c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x8681 2896 bytes
font_02_sfnt_off00009066.bin
59b82efa7141ba2b07d91e3b641cbf682cee4575ed292f5ecf89ba3b7e2e2e13
pdf-font-stream PDF embedded font (sfnt) at offset 0x9066 17456 bytes