Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b42aa40311db18…

MALICIOUS

PDF

42.9 KB Created: 2021-06-03 09:51:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: cc1e1a31f9391995bea3ae6d1db78ba0 SHA-1: 9a494ec0cac8007762a25fe2317087cdb2a35c00 SHA-256: 31b42aa40311db18c3d2a6612e16305493e1e4ea02f75ba5749335ca329d4065
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple embedded links designed to lure users into clicking on them by promising "Coin Master Hack" or "free Robux". The primary link, https://netcdn.online/app/406889139/coin-master-hack-game-hack, is flagged as a known malicious redirector. The document's structure and content strongly suggest a phishing or scam attempt, likely intended to lead users to malicious websites or download further malware. No scripts were extracted, but the presence of multiple malicious links is sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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.online/app/406889139/coin-master-hack-game-hack In PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-online-free_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-unlimited-spins_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-get-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/minecraft-pocket-edition-free-ios_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-coins-app_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-card-collection-in-coin-master_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/omplete-surveys-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-minecraft-client_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/roblox-hacks-for-mac_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-tiktok-coins-2021_GM835599320.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/robux-match_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
stream_004_off00004e4c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E4C 24864 bytes
SHA-256: c01d3ad4f74c06b4c96c327eafec10c16a74808781f0008bfa1af8fd1484562d
font_01_sfnt_off000086b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86B1 17716 bytes
SHA-256: c15a8689411d8cca9ab0759ab4c496fe9b4353d676dd738e300719e9588112ed

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