Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2448376195d459…

MALICIOUS

PDF

35.1 KB Created: 2021-07-04 12:36:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cee177301ce46e0a22afe3efcdc3ad0c SHA-1: 72712279b22b49aac8a6646d94e8b09aecbebf8e SHA-256: ca2448376195d4595cb874e7d83e31f9200bc6992b0c6ab4f37425446ba15e71
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that lead to pages offering hacks and free items for popular games, indicating a lure for users to download potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm heuristic further supports its malicious intent. The document body, though partially corrupted, contains references to these lures and embedded URLs.

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/406889139/coin-master-free-spin-realme-products-game-hack PDF link annotation
    • http://foo.com.tw/files/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/download-games-for-free-robux_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/roblox-phantom-forces-money-hack-2021_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/cheat-car-crusher-2-update-11-roblox_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/roblox-com-roblox-play-for-free_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-become-a-vip-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/www-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-how-to-complete-heavy-metal-machines_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-free-robux-no-human-verification-2021-ipad_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/roblox-bleach-primera-hack_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/robux-now_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-be-all-black-in-roblox-free_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/pubg-uc-nedir_GM1330123889.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-reward-link_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/como-hacer-un-hack-en-roblox_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/prison-life-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/roblox-tutorial-free-items_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
stream_002_off0000310f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x310F 23120 bytes
SHA-256: a6718fe185cbb029ff5eb097db732d5859d53561d0c2b86dbe5160747f02e78a
font_01_sfnt_off000064d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64D1 18976 bytes
SHA-256: 9a063faea9114050ab3b1da930e9c077db51df0f0eeb33b8a77db856b87907e7