Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20c258e7f55a551…

MALICIOUS

PDF

44.5 KB Created: 2021-06-04 02:59:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 00264c5374b1c39939bb5b9c8fdcaf9d SHA-1: 5501d47eb8d03e699482ae5e650958c312049ca0 SHA-256: c20c258e7f55a551a6a8ef3fca0ac5d24f180440beb84002868b187c55cfa38c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising free game hacks and generators. The ML classifier strongly flagged this PDF as malicious, and the embedded URLs are associated with known malicious redirectors. The primary goal appears to be luring users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.online/app/431946152/roblox-free-roblox-game-hack In PDF document text
    • http://perpus.wdh.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-free-spins-for-iphone_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-promo-codes-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/roblox-verification_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/what-is-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-spin-link-for-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/how-to-get-free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-free-coins-today_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/hacks-and-cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/master-coin-hack_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/apps-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-hack-version-download_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e42.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E42 30000 bytes
SHA-256: b18a1ace31177934bba4d69e57d0ce943edddb481aa39009b8a9ffcefcad0e26
font_01_sfnt_off0000913a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x913A 17948 bytes
SHA-256: 33938510eb20d060112d7682b9c88b880e5c2c8c33e748f0e85f3cc6be6c07ce

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