Malicious PDF — malware analysis report

Static analysis result for SHA-256 61376f4df0e4bf82…

MALICIOUS

PDF

48.7 KB Created: 2021-06-13 22:59:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5ac0f930ad05f3c81f4bb6a404442705 SHA-1: e247a1030344c88ac404a9d74a8d05c96569aabc SHA-256: 61376f4df0e4bf82443cdeb14e48a1f70187afbc757c0bb6f42f2ed87969379d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, masquerading as game-related downloads. The heuristic firings indicate the document is designed to lure users to these malicious sites, likely for further exploitation or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9228

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 http://netcdn.co/app/431946152/descargar-hack-de-roblox-deathrun-game-hack In PDF document text
    • http://centr-expert.su/images/medival-gives-free-robux_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/master-coin-free-link_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/pokemon-go-free-40k_GM1094591345.pdfIn PDF document text
    • http://centr-expert.su/images/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/www-coinmaster-com_GM406889139.pdfIn PDF document text
    • http://centr-expert.su/images/roblox-robux_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/free-minecraft-server-hosting-with-plugins_GM479516143.pdfIn PDF document text
    • http://centr-expert.su/images/change-money-in-roblox-using-cheat-engine_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/minecraft-hacks-ps4_GM479516143.pdfIn PDF document text
    • http://centr-expert.su/images/free-robux-accounts_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://centr-expert.su/images/free-games-like-minecraft_GM479516143.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_003_off0000499a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x499A 27756 bytes
SHA-256: ed6d8cbd83fb60d8de6967cf0d3bfb4e812b59b7a7e647d48298cf24d1183ea7
font_01_sfnt_off00008939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8939 5116 bytes
SHA-256: 2b58080dcca13f6dfaee3f5b9619251253740ea0f77351904946a6ab1f645ece
font_02_sfnt_off000099c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99C9 19048 bytes
SHA-256: 5c9df7e957e2247a513a9877fe4c0475cbce6ae162c4ce179da0897d2125bac3

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