Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ae76c0b994f226…

MALICIOUS

PDF

41.3 KB Created: 2021-05-20 03:11:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 41d94f3b34a84204fe9e854a8b732179 SHA-1: def2df89c67f906ca78bff6197e7ad7ee162b926 SHA-256: b1ae76c0b994f226822367ffb3498c7ed1f1ea9f230dadf5e82444dbfa619916
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically promoting 'free Robux' or game hacks. The primary lure URL is https://netcdn.xyz/app/431946152/oprewards-free-robux-game-hack, which is associated with malicious redirector infrastructure. The document body and embedded URLs suggest a phishing or scam attempt to trick users into visiting these malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/oprewards-free-robux-game-hack In PDF document text
    • http://cruzdelsur.ru/images/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://cruzdelsur.ru/images/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://cruzdelsur.ru/images/roblox-hack_GM431946152.pdfIn PDF document text
    • http://cruzdelsur.ru/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://cruzdelsur.ru/images/coin-master-free-rare-cards_GM406889139.pdfIn PDF document text
    • http://cruzdelsur.ru/images/game-give-free-robux_GM431946152.pdfIn PDF document text
    • http://cruzdelsur.ru/images/free-t-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://cruzdelsur.ru/images/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://cruzdelsur.ru/images/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://cruzdelsur.ru/images/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://cruzdelsur.ru/images/roblox-robux_GM431946152.pdfIn PDF document text
    • http://cruzdelsur.ru/images/coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://cruzdelsur.ru/images/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://cruzdelsur.ru/images/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://cruzdelsur.ru/images/how-to-hack-coin-master-in-pc_GM406889139.pdfIn PDF document text
    • http://cruzdelsur.ru/images/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://cruzdelsur.ru/images/free-roebucks-com_GM431946152.pdfIn PDF document text
    • http://cruzdelsur.ru/images/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://cruzdelsur.ru/images/play-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://cruzdelsur.ru/images/codes-how-to-get-free-robux_GM431946152.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_003_off0000464e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x464E 24072 bytes
SHA-256: 19b48b12498a36b43c2b42d0f4f868373e4a4bde75cb1f19797d9840491992da
font_01_sfnt_off00007d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D75 18756 bytes
SHA-256: ea6a04d6c65882c9dd78ee7ca96c70e45062fdc6b69d68e2fcdc099d3abb6428

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