Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7bd7aea8139396…

MALICIOUS

PDF

41.3 KB Created: 2021-05-11 00:33:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: eac4e39d735a63d27fc45c4737313051 SHA-1: 0d9488ed7f7ddda12e985288c6da681b5814d436 SHA-256: 8d7bd7aea8139396a8fffeb31246e1da3444e559fb0a32d5f2a15f693e308a36
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically luring users with a 'free generator / game hack' theme. The embedded URL, https://netcdn.xyz/app/431946152/free-roblox-shirt-templates-2021-game-hack, is associated with known malicious infrastructure. The document body also contains a call-to-action phrase, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0125

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-roblox-shirt-templates-2021-game-hack In 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
stream_003_off0000348f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x348F 26000 bytes
SHA-256: 6f15053d5321fb1bc0846f8b15de69340c0ee3211165783a111397eee0a2edc3
font_01_sfnt_off00007045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7045 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00007ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CED 19404 bytes
SHA-256: ab8fe64e6c41782caa49eba716c047f70273e0fcd9fd260fc178e39564bef5ea

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