Malicious PDF — malware analysis report

Static analysis result for SHA-256 b787180c3e87561d…

MALICIOUS

PDF

32.6 KB Created: 2021-06-28 06:07:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b05c0c61e762ca01c96d3265c5a130fc SHA-1: c87de6c2511a2c8e50a3cb2f34f642cf9a22b2d1 SHA-256: b787180c3e87561d90cd051194358f14d879a4d9e3f94f38427fddf39b277ad6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically http://netcdn.co/app/431946152/roblox-cheat-engine-code-for-robux-game-hack. The document body and heuristics indicate a lure for game hacks and free currency, designed to trick users into clicking the malicious links. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/roblox-cheat-engine-code-for-robux-game-hack In PDF document text
    • https://www.knjiznica-oroslavje.hr/files/how-to-hack-coin-master-with-root_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/roblox-imagine_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/robux-premium_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/how-to-get-free-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-free-coins-facebook_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-roblox-items-catalog_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-roblox-hair-girl_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/install-coin-master_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/how-to-earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/how-to-get-free-roblox-2021_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/what-do-roblox-points-do_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-free-coins-and-spins-today_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-pokemon-go-accounts-level-35_GM1094591345.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-coins-and-spins-2021_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
font_00_sfnt_off00002a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A05 21720 bytes
SHA-256: 68d147f7553e9bdc2f9c04f508cfe657318221b5edee525edae3f1dde4f61525
font_01_sfnt_off000059b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59B4 19352 bytes
SHA-256: 359462dc0e032d3c4009f21114c350a4be373895c7056b632c830e6d5a0d8dc9

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