Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c57150516e8586…

MALICIOUS

PDF

35.0 KB Created: 2021-06-18 21:49:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d09fe92e10ef1ea0a1d855a2011660a5 SHA-1: 58585d663430711fd7115b20b19ec84f43303e67 SHA-256: e3c57150516e858620beed2e54e722c15a56803b5ece0374c8aeecfb748ec009
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, which in turn hosts further PDF files. These documents are designed to lure users with promises of game hacks and virtual currency, likely as a pretext to deliver further malware or engage in phishing. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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.co/app/431946152/roblox-jailbreak-money-hack-2021-game-hack In PDF document text
    • http://www.riverkennet.org/uploads/files/files/bloxfree-free-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-hack-coin-master-game-ios_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/open-coin-master_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/robux-for-offers_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-spin-link_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-flip-master-coins_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/near-tiktok-free-account_GM835599320.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/git-free-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-online-hack-download_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/get-free-robux-without-doing-anything_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_off00003036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3036 22240 bytes
SHA-256: 2e5d467662e821f129d0c3341fabc94e8a5b60fa46c6a69fa0a242519983f704
font_01_sfnt_off000061a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61A4 19720 bytes
SHA-256: e92b57959da560cbe84f613d86d5066a1a4ab5c16e3737efc0dbf18090cac90e

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