Malicious PDF — malware analysis report

Static analysis result for SHA-256 734c4a8223c1b53b…

MALICIOUS

PDF

37.4 KB Created: 2021-05-22 16:26:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 53b5ba74ef201a7fb448f376ccfebc25 SHA-1: 0865bcc5667ccb1d9fb0e276fa309dc3d74e327d SHA-256: 734c4a8223c1b53b9d239fe161ced146ebed7ba386cfd91f565da50413eea249
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising 'free Robux' or 'game hacks'. The document body and heuristics indicate a lure to trick users into clicking these links, likely to download a second-stage payload. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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/free-robux-2021-game-hack In PDF document text
    • http://torkelson.se/images/need-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/coin-master-free-spins-and-coins-for-iphone_GM406889139.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_off00003455.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3455 25944 bytes
SHA-256: 4d6ff63f3984394f19e5d240973a752a0486f04a0efdbbee5552f0722afa0a49
font_01_sfnt_off0000705e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x705E 18416 bytes
SHA-256: a2c808792aaeb1607b9c3a91ae122c662faffffe8d42f3cf4118be6ccc5b3e7b

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