Malicious PDF — malware analysis report

Static analysis result for SHA-256 255cf1a1113ee79a…

MALICIOUS

PDF

41.7 KB Created: 2021-05-21 12:09:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8cf28de5f635104ca78f8a08d89cecd9 SHA-1: d3b9ff4bef73773fa308e85a876c09ace261a9c4 SHA-256: 255cf1a1113ee79aa905579ae8e57656935a1aff906db46c8bf455500cb28145
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains, specifically advertising 'free Robux' or 'game hacks' to lure users. One primary URL, https://netcdn.xyz/app/431946152/roblox-free-robux-website-game-hack, is identified as a malicious redirector. The document body also contains a call-to-action phrase, 'CLICK HERE TO ACCESS ROBLOX GENERATOR', reinforcing the lure. While no scripts were explicitly extracted, the heuristic firings strongly indicate a malicious redirection workflow, likely leading to phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7527

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/roblox-free-robux-website-game-hack In PDF document text
    • http://lekarinfo.mk/images/tiktok-free-template_GM835599320.pdfIn PDF document text
    • http://lekarinfo.mk/images/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • http://lekarinfo.mk/images/free-robux-no-email_GM431946152.pdfIn PDF document text
    • http://lekarinfo.mk/images/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://lekarinfo.mk/images/2021-free-spins-coin-master_GM406889139.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
stream_002_off0000334a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x334A 27520 bytes
SHA-256: bdbbd388d09aa27e55fd1e3ee77ecc7b9141917e7c4cfc0ee2bbb70b6f2201f1
font_01_sfnt_off000073b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73B4 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off000080c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80C6 18508 bytes
SHA-256: fbcd203c7e924a0ebec4ef4aa0eb55ec8b14d1abcc2767c4f5d3ad1ccc86f8e3

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