Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85639a239c791db…

MALICIOUS

PDF

37.9 KB Created: 2021-05-20 22:45:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7bee5a3791a2f77458a65688510a3cf9 SHA-1: 290cda9523023abdf5b921ebdc3640cba5146e43 SHA-256: a85639a239c791db3bdabc5e67891397f12d5a70dc0cfb5aeffb2f968adb6ca4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including one identified as a malicious redirector for 'Roblox Hacks And Cheats'. The presence of these links and the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic strongly suggest a phishing or malware distribution attempt. The document body and heuristics indicate a lure for game-related cheats, likely leading to a download or further malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9407

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-hacks-and-cheats-game-hack In PDF document text
    • http://schmittmusik.de/images/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • http://schmittmusik.de/images/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://schmittmusik.de/images/coin-master-attack-hack-apk_GM406889139.pdfIn PDF document text
    • http://schmittmusik.de/images/pubg-800-uc_GM1330123889.pdfIn PDF document text
    • http://schmittmusik.de/images/rbx-place-free-robux_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_off000033e0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33E0 27696 bytes
SHA-256: 9ffdcb2ab4be2f42f9afd80901b5118c45b7b0e9b8c9dedef9fd1599cb067714
font_01_sfnt_off000071f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71F0 18624 bytes
SHA-256: fd38699d39b76a4f9eae772e1d62c447b40f492bf7651a7365d5b223074a20b1

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