Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bbfcb007a0ebe1…

MALICIOUS

PDF

44.8 KB Created: 2021-04-27 00:27:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f8da2bc46feb4bf812cfe9bd97ab189e SHA-1: d80fc3a746743b3e244668e0fba71cb1eef2a384 SHA-256: 55bbfcb007a0ebe16525ce80a093e3efaf308e21414e91cc63f9c61b26f0cd9d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and websites promising game hacks and free Robux, indicating a lure for users to download potentially malicious content or be redirected to phishing sites. The document body and embedded links strongly suggest a scam aimed at users interested in the Roblox game. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

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/roblox-hack-download-pc-free-robux-game-hack In PDF document text
    • https://gigbagwinkel.nl/images/free-robux-code-hack.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/cheat-codes-on-assassin-in-roblox.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/get-free-robux-codes-now.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/roblox-dex-explorer-hack.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/what-free-program-for-roblox-shirts.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/free-stuff-in-roblox-catalog.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/cheats-for-egg-farm-simulator-roblox.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/roblox-cheat-geld-deutsch.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/how-to-get-free-robux-2021-working-august-2021.pdfIn PDF document text
    • https://gigbagwinkel.nl/images/how-to-get-accessories-in-roblox-for-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_off000042f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x42F7 27632 bytes
SHA-256: 171e6fd4980620541916352d250aeb5e519f8e36be385a76f3baa8c225162f90
font_01_sfnt_off0000810b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x810B 2848 bytes
SHA-256: 4737c2778a085e0cb49e73f3b054b1a71e3f40720d213b4bfda97f95a31bfbf1
font_02_sfnt_off00008acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ACC 19148 bytes
SHA-256: 03d4aa268b0aeed897447f465a5829ddfdc76d252cd00dbd4baaa58b6e6b23db