Malicious PDF — malware analysis report

Static analysis result for SHA-256 4891bf302f2beed1…

MALICIOUS

PDF

46.6 KB Created: 2021-06-11 06:09:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: bd9d28d0cff0b8bb966be123d0ced7e2 SHA-1: 83f304452eb4d85b55c3f28e00eea21bf65bda33 SHA-256: 4891bf302f2beed145076074687d147f25c98047576a6914b81010a0dd051b7f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically advertising 'free generator / game hack' lures. The presence of a download button heuristic further supports the malicious intent of directing users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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 https://netcdn.tw/app/431946152/roblox-shoes-free-game-hack In PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-spins-and-coins-group_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/minecraft-app-store-free_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/free-roblox-accounts-2021-rich_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-accessories-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/download-the-free-robux-generator-for-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/gamehunters-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-hack-tool-access-online-generator_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-to-get-minecraft-bedrock-edition-on-pc-for-free_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-hack-spin-link_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/cheat-engine-64-free-download-roblox_GM431946152.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_off00004d8c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D8C 31404 bytes
SHA-256: f0450dfc9b80270341b258ac4e9ee39966a6c17d3e2b6e27ae03b28dc2c21225
font_01_sfnt_off0000942e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x942E 18116 bytes
SHA-256: b785cfdd3e5c45ff6fd96e48e83799db6f18ba17522ec74d7347cd181e292f14

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