Malicious PDF — malware analysis report

Static analysis result for SHA-256 691b2528aeaeb5b8…

MALICIOUS

PDF

44.8 KB Created: 2021-06-03 05:21:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: bd01e293e8d5da7412ba0267ce3a3bf6 SHA-1: 1604301498168ddc79f26ad3ba828cfcb7151cca SHA-256: 691b2528aeaeb5b8af0a8197ec5d8eccff3f3f5de437509c9efb4478a630902b
102 Risk Score

Malware Insights

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

The PDF contains a large number of links to external resources, many of which are disguised as game hacks and cheats. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, and the ML classifier flagged the document as malicious. The document body, though heavily obfuscated, contains URLs that align with the heuristic findings, suggesting a lure to download potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/479516143/optifine-pe-game-hack PDF link annotation
    • http://pustaka.bbppketindan.info//repository/coin-master-game-android-free-download_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-reward-link_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-unlimited-spin-and-coin-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/pokemon-go-free-pokeballs-no-human-verification_GM1094591345.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-spin-coin-master-new-link_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/multiplayer-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-spins-coin-master-ios-links_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-gold-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-coin-app_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-hack-apk-download-for-android_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-hack-online-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-mod-version-free-download-ios_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-coins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-free-spin-reward-links_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-robux-today_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51C4 29124 bytes
SHA-256: 546823f9504b022c9d8ca13e2343eee150c00d7baf20db80d0090f850420da04
font_01_sfnt_off00008ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ECE 17672 bytes
SHA-256: 5a469ca17a8c140357c1150986cbf8b325a348879e3a8ed2f5f73ca7af5c2fd6

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