Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9df889208e2926…

MALICIOUS

PDF

44.2 KB Created: 2021-04-24 23:02:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ef704ca4fa9212c5af94f9e6a5775a78 SHA-1: bd7037008dffdca6da1ab0c63aea5891793f8a25 SHA-256: bb9df889208e29262fe3d21d43dab0f2ee6f0940868358e1cf274bd56af4fba5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector. The primary lure is for "free Robux" and "game hacks," which is a common social engineering tactic. The document's structure and embedded links suggest it is designed to lead the user to potentially malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/431946152/free-robux-codes-2021-may-game-hack In PDF document text
    • http://www.drent.se/images/roblox-hack-free-robux-hack-2021-ios-android-pc.pdfIn PDF document text
    • http://www.drent.se/images/how-to-get-free-robux-and-tix-on-roblox-2021.pdfIn PDF document text
    • http://www.drent.se/images/pointsprizes-free-robux.pdfIn PDF document text
    • http://www.drent.se/images/hack-roblox-page.pdfIn PDF document text
    • http://www.drent.se/images/free-robux-gft-cards.pdfIn PDF document text
    • http://www.drent.se/images/how-to-use-mega-to-hack-roblox.pdfIn PDF document text
    • http://www.drent.se/images/robux-hack-validation-code.pdfIn PDF document text
    • http://www.drent.se/images/cheat-in-roblox-jailbreak-2021.pdfIn PDF document text
    • http://www.drent.se/images/how-to-get-free-robux-iphone-7.pdfIn PDF document text
    • http://www.drent.se/images/shiros-hair-roblox-free.pdfIn PDF document text
    • https://freerobux.cyouIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000041c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x41C9 26588 bytes
SHA-256: 7121556fecc2581f9700f878997ad6d736f9396a5a0fab3fb49a896d56624e97
font_01_sfnt_off00007e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E55 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00008806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8806 19196 bytes
SHA-256: a185583bac342b0b6ad25695485d86e2139188966b0e858d457d33071a50e4b4