Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5ab3016225b5f9…

MALICIOUS

PDF

41.6 KB Created: 2021-04-28 15:11:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 84e59f6ff7b48c98921fb8b0eb98eaad SHA-1: 1d6dc825b4219f39e1ef0f0532204bdb3c3feb97 SHA-256: 9a5ab3016225b5f9ee0bb7f91e4bd60d6d2c74058ea6e23cf38f3ca2ca435333
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for 'free generators' and 'game hacks', directing users to a malicious URL. This URL is flagged as part of known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to the malicious URL and appears to be generated by wkhtmltopdf, suggesting it was likely delivered as a spearphishing attachment.

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/how-to-hack-other-roblox-accounts-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_off0000360b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x360B 27848 bytes
SHA-256: 92a4d185882db86c7185a09ed15cc7aa8e139e3ad19e1b1bd108734a182ca23a
font_01_sfnt_off00007488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7488 3312 bytes
SHA-256: 40bd8eebcb3a0d68a8646f1930e84f30a44bfa48525263c6c528f0bc1e9c1677
font_02_sfnt_off00007fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FD7 18756 bytes
SHA-256: 3f691576fbb5bfc70a10dec5776d0d901166a2aee05273c30c66399d18340163

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