Malicious PDF — malware analysis report

Static analysis result for SHA-256 137b87752344e7eb…

MALICIOUS

PDF

37.3 KB Created: 2021-05-21 03:09:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 378f9022899ce7d653c4606dbe09ec7a SHA-1: 274880ea30832d2a54de47072ce4d305046cd74c SHA-256: 137b87752344e7eb38cf40ba3ef020b1b7fab24afca1dd7063d562ac4b6e6917
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering "free generators" or "hacks" for popular games, which are known lures for malicious activity. One of the primary links, https://netcdn.xyz/app/431946152/actual-free-robux-game-hack, is identified as a malicious redirector. The document body and embedded artifacts suggest a social engineering attempt to trick users into visiting these sites, likely leading to further malware downloads or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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/actual-free-robux-game-hack In PDF document text
    • https://newenglandafs.com/images/coin-master-100-spin-hack_GM406889139.pdfIn PDF document text
    • https://newenglandafs.com/images/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://newenglandafs.com/images/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • https://newenglandafs.com/images/can-you-get-minecraft-windows-10-for-free_GM479516143.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_off00003225.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3225 26816 bytes
SHA-256: f11ae8ff8d8e0890baab16636ad49d46794b5a33ec57abe68fc7cfbe09dc8d8a
font_01_sfnt_off00007011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7011 18420 bytes
SHA-256: 37b67a04c59087902b42b65f26bec20808041b5185ddbc4d4c9e15973e68d0ef

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