Malicious PDF — malware analysis report

Static analysis result for SHA-256 e227343f7167d655…

MALICIOUS

PDF

39.1 KB Created: 2021-05-22 12:42:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 01ce6895212059ff666568023b94dac5 SHA-1: b563c42ab4f5b6e54eb4a98eb817aac76dd0de8b SHA-256: e227343f7167d655a7566373abf0a2abe8d8962163ba834b3d6db97db0611c13
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising "free Robux" and "game hacks" to lure victims. The document body and heuristics confirm the presence of these lures and malicious redirector infrastructure. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript for redirection or exploitation, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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-robux-no-human-verification-game-hack In PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-cheat-engine-hack_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/tiktok-free-names_GM835599320.pdfIn 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
font_00_sfnt_off0000322d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x322D 24972 bytes
SHA-256: 55c29f1f84de35894b508525eba33113162067aee1c72cd2b54e95bfb65b8d83
font_01_sfnt_off00006b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B9F 2816 bytes
SHA-256: 4555740682277f0055d57b15bd0ba953e5b51415ea3d21c93db391eace072d4f
font_02_sfnt_off000075b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75B0 18860 bytes
SHA-256: 7bf6b254896799c3550cbaf8339a45bd8c79022df116fd793fc899e49cde55bc

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