Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46c47b929e3183c…

MALICIOUS

PDF

34.2 KB Created: 2021-07-08 09:38:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b3479160214ad7690e635925e9715512 SHA-1: a85104af250132544380222adf386d7828f61873 SHA-256: b46c47b929e3183ce844f87402ef4712e825ae8a52310c7a8805048736b7c9c3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a high-confidence ML classification indicating maliciousness and an embedded URI pointing to a suspicious domain. The document body, though partially garbled, suggests a lure related to game hacks ('Legit Coin Master Hack'). The presence of a download-related heuristic further supports the attack pattern of tricking the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.tw/app/406889139/legit-coin-master-hack-game-hack In PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/roblox-cheat-2021-murder-mystery_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/free-robux-no-bc_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/how-to-permanently-have-free-robux-with-inspect-element-2021_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-hack-tool-access-online-generator_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/how-to-get-free-clothes-without-robux_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/roblox-hack-app_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/hack-roblox-exploiting_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/how-do-i-earn-robux_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/how-do-you-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/roblox-download-free-microsoft_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/minecraft-wurst_GM479516143.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/oprewards-robux-free_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/roblox-mac-os-x-free-download_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/how-to-hack-roblox-games-no-downloads-2021_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/hack-roblox-admin-tool_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_002_off00002fb9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FB9 23092 bytes
SHA-256: e6be8847db4243ea0c72ab53f4dfc4905800a02f1fbd1f846f05137f25ea6d06
font_01_sfnt_off000063b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63B2 18004 bytes
SHA-256: 92eee47508cc51aff6e3d487e9033971e75a5957dfea389123b9d70a072beebe