Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55c94a854f92128…

MALICIOUS

PDF

36.1 KB Created: 2021-05-20 20:36:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ef135180375f27bc5fbca299624acc36 SHA-1: bedf60991fa018e2a6a8c0f112123cc40f9168f3 SHA-256: d55c94a854f92128c6c8deba20feda4a75ae23eeb60d910faef63d4c30060e92
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and known malicious infrastructure, disguised as a lure for 'free Robux' or 'game hacks'. The document body and heuristics indicate a clear intent to trick the user into clicking these links, which likely serve as a gateway to further malicious activity such as phishing or malware distribution. No scripts were extracted, but the embedded URLs and redirector lures are strong indicators of a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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/claim-free-robux-button-game-hack In PDF document text
    • http://mklista.ru/images/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://mklista.ru/images/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://mklista.ru/images/coin-master-hack-tool-pc_GM406889139.pdfIn PDF document text
    • http://mklista.ru/images/coin-master-free-spins-link-october-2021_GM406889139.pdfIn PDF document text
    • http://mklista.ru/images/minecraft-pe-texture-packs-free-download_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_off000031f7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31F7 24448 bytes
SHA-256: 20877b77f3420fb8a49f95383de932235150b7abd9fc4d6110e46f8aa5300859
font_01_sfnt_off00006a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A27 18800 bytes
SHA-256: a65a8cc7dc4bcbd85f0772ba27416f5bddaec9beaf507a16cddd286b7aed5464

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