Malicious PDF — malware analysis report

Static analysis result for SHA-256 21be3adbc9587885…

MALICIOUS

PDF

40.6 KB Created: 2021-05-24 02:09:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 97892dd6ec717f4d6529c5fd3b44801e SHA-1: f24b9647c934024e954e7255da7fe6b5783d8ae4 SHA-256: 21be3adbc9587885cd6d4c3cb48e5a5269293f58e850e0a73915ff69ba297fd7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to known malicious infrastructure, specifically promoting 'free Robux' or 'game hacks'. The document body and embedded artifacts further reinforce this lure. The ML classifier also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7776

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/blox-fish-free-robux-game-hack In PDF document text
    • https://gryps.de/images/free-robux-real_GM431946152.pdfIn PDF document text
    • https://gryps.de/images/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://gryps.de/images/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • https://gryps.de/images/roblox-free-roblox_GM431946152.pdfIn PDF document text
    • https://gryps.de/images/is-java-minecraft-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31BD 27928 bytes
SHA-256: 8c8af861177fed749db77ca3212b0ebccc7c0829908faaa6c917f9e1f7c67c2f
font_01_sfnt_off0000728c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x728C 3084 bytes
SHA-256: 4889dc98a6bfd3c9244583f92387be58625a91e7a969778ad35ada89b27ed636
font_02_sfnt_off00007d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D32 18376 bytes
SHA-256: 833bfe47d36e77ffff594e1188eeee77c72f4d78f65cd820fb361f10e8c51563

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