Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c7ac41fda1308cb…

MALICIOUS

PDF

49.2 KB Created: 2021-06-09 17:28:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6b58f9549a54eab28eb96c2727d65cd2 SHA-1: bdbaa8658dd43395304381aa200c40e07a5f85a5 SHA-256: 2c7ac41fda1308cbf6185876816a5ea8539a9398de9cc0754e938e386315f950
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures related to game hacks and free in-game currency. The document body, though partially corrupted, contains text and URLs consistent with a phishing or scam attempt. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/how-to-hack-oney-on-ud-roblox-game-hack In PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/my-minecraft-account-was-hacked_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-35-2-hack_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/easy-robux-today_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/freer-pro-tiktok-fans_GM835599320.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/gamehunters-club-coin-master_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-get-free-tiktok-followers-without-human-verification_GM835599320.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/easy-roblox-today_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/best-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/roblox-svg-free_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/get-robux-now_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/hack-roblox-players_GM431946152.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/roblox-roe-free_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/minecraft-bedrock-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052bd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52BD 25988 bytes
SHA-256: 4d9d9b1aa9523001a44ff40f3982f851ba69c64de3f744ba47f577d700705123
font_01_sfnt_off00008e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E6A 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B7B 18888 bytes
SHA-256: b7d05a6882b452aa7c8d605cf2bede4dd9223d57004a03ca4fa224d3cf054b2b

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