Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51c350c75149b8e…

MALICIOUS

PDF

42.8 KB Created: 2021-05-19 19:00:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: cacdc6f00991e62077f2344d306d50ba SHA-1: 8103891e054d16d8ed469e3c89d6579b9e3c8a30 SHA-256: b51c350c75149b8e336b6d70dcd9df4af432201df090a711edf5d5fe1c3525f0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains links that lead to known malicious redirector infrastructure, specifically designed to lure users with promises of free game items or hacks. The primary malicious URL identified is https://netcdn.xyz/app/431946152/can-i-get-robux-for-free-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scamming attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/can-i-get-robux-for-free-game-hack In PDF document text
    • http://www.oden.vn/upload/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.oden.vn/upload/files/coin-master-free-coins-today_GM406889139.pdfIn PDF document text
    • http://www.oden.vn/upload/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://www.oden.vn/upload/files/coin-master-cheat-engine-hack_GM406889139.pdfIn PDF document text
    • http://www.oden.vn/upload/files/coin-master-links-that-don-t-expire_GM406889139.pdfIn PDF document text
    • http://www.oden.vn/upload/files/minecraft-wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.oden.vn/upload/files/coin-master-daily-free-spins-today_GM406889139.pdfIn PDF document text
    • http://www.oden.vn/upload/files/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://www.oden.vn/upload/files/coin-master-hack-root_GM406889139.pdfIn PDF document text
    • http://www.oden.vn/upload/files/how-do-you-get-free-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.oden.vn/upload/files/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://www.oden.vn/upload/files/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://www.oden.vn/upload/files/blox-fun-info_GM431946152.pdfIn PDF document text
    • http://www.oden.vn/upload/files/coin-master-free-coins-and-spins-link-today_GM406889139.pdfIn PDF document text
    • http://www.oden.vn/upload/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.oden.vn/upload/files/coin-master-free-spin-and-coins-links-home_GM406889139.pdfIn PDF document text
    • http://www.oden.vn/upload/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://www.oden.vn/upload/files/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.oden.vn/upload/files/get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.oden.vn/upload/files/free-robux-scams_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
font_00_sfnt_off00004893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4893 25996 bytes
SHA-256: 8944214ac861ce608cb5089f421f18f337e22336aaeb8c81f44bdeb78dfd50a5
font_01_sfnt_off0000856c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x856C 18344 bytes
SHA-256: 56a64ad9af2fab004080c55c49ec35472f3c2134e95e40197be892b268dd39d5