Malicious PDF — malware analysis report

Static analysis result for SHA-256 f894a636085abc05…

MALICIOUS

PDF

40.1 KB Created: 2021-04-30 03:21:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5d3e285329f14bb203e5f914808c0b65 SHA-1: 945b888f21f3a0081258db38a84cd5918d5012ce SHA-256: f894a636085abc05d22d137c2444e46df77732f4180e2ade7e77e21c74a9ed81
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting "game hacks" and "generators" for Roblox. The heuristic firings confirm these links lead to known malicious redirectors and a lure for game hacks. While no scripts were extracted, the embedded links and the nature of the lures suggest an attempt to drive users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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-hacker-march-18th-2021-game-hack In PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-roblox-hack-com-free-roblox-hack.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/best-free-exploit-roblox-bing.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/cheat-rocket-roblox.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-cheats-no-human-verification.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/robux-cheats-no-human-verification.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/pokeon-ultra-brick-bronze-roblox-free-shiny.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/slurp-hack-roblox-jailbreak.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-a-free-knife-in-roblox-assassin.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/hack-gratis-robux.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-shirt-roblox-avatar.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_003_off00003f20.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3F20 24704 bytes
SHA-256: 16a4314ef32b9bc4b99e35a4cded1a512d55d57907cd21854b37fd1682454d9d
font_01_sfnt_off000077f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77F3 19260 bytes
SHA-256: b75f0d591fa85a03fa3b40b30a7a4d56141bb85f8568161b04e6b0928f05238d