Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf4700a46f16758…

MALICIOUS

PDF

34.0 KB Created: 2021-07-06 13:37:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b665ec4895ed0c096ebfd89002e50070 SHA-1: 4237efc13647ef232f01e80b34ddedfe4128c204 SHA-256: 4bf4700a46f167588ec59a16987b7b7ffbd97ca1857446cd01d0a2e66ccbf517
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to external websites, many of which are SEO-optimized with keywords related to free game currency and hacks. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' heuristic suggests a deceptive user interface. The primary attack pattern involves luring users to potentially malicious sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.tw/app/431946152/promo-codes-for-free-robux-game-hack PDF link annotation
    • http://chem.ipb.ac.id/kim/repository/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/minecraft-dungeons-free-download-pc_GM479516143.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/flame-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-free-pin_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-printable-roblox-images_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-70-spin-link-today_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-hack-apk-with-fb-login-2021_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-hacks-and-cheats_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-test-for-free-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/hack-coin-master-ios-download_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/facebook-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-get-free-clothes-on-roblox-without-builders-club_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_off00002ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EC7 21852 bytes
SHA-256: 7650cf488f557ecaa82c3cf430122f91c9199620ea55a48c7346903ef1d2331f
font_01_sfnt_off00005f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F03 19304 bytes
SHA-256: 8f108eb77a448bab32907087749351f9dfb7449b9cf832684ec1eb90d477be7f

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