Malicious PDF — malware analysis report

Static analysis result for SHA-256 61df099b1802297d…

MALICIOUS

PDF

28.6 KB Created: 2021-06-21 09:41:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 52110ab11a97623b6c54830668432085 SHA-1: f4a57f596158850d694946b777f3bc8fc5c5b67d SHA-256: 61df099b1802297da4d66cb88dd3f7a37fd41c3f211eb54093b7c176901c6c29
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a critical heuristic firing for a redirector link that leads to a 'free generator / game hack' lure. The document body reinforces this by displaying a similar title and a call-to-action phrase. The embedded URL is the primary indicator of malicious intent, likely leading to a further stage of infection or a phishing site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0330

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 http://netcdn.co/app/431946152/how-to-get-free-stuff-on-roblox-2021-game-hack In 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_001_off00001766.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1766 22968 bytes
SHA-256: 2f031c8aaff4ea1430233131fa879a152813a5ef3762657ba139e867803388b5
font_01_sfnt_off00004acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4ACC 19460 bytes
SHA-256: 8426f038795ea5d8a795bf0375a678dc031ed66a2a703316a826a74a76c6ece6

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