Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6234c644a5d5fd…

MALICIOUS

PDF

35.2 KB Created: 2021-07-03 14:23:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 831c87253995916cf08e8bf886ba6079 SHA-1: 978be44f4773177f852b0568476d3a7e7ebf181a SHA-256: fb6234c644a5d5fd3cd5e96d1f3d4ecf065d68acf95064802cfa30b0fafce913
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to scam pages, specifically promoting 'game hacks' and 'free Robux'. The primary link, http://netcdn.tw/app/431946152/how-to-hack-and-get-free-robux-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a social engineering attack aimed at tricking users into visiting malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://netcdn.tw/app/431946152/how-to-hack-and-get-free-robux-game-hack In PDF document text
    • https://e.mtsattaqwa10terpadu.org/__statics/gudangsoal/files/coin-master-daily-free-spins-link-download_GM406889139.pdfIn PDF document text
    • https://e.mtsattaqwa10terpadu.org/__statics/gudangsoal/files/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • https://e.mtsattaqwa10terpadu.org/__statics/gudangsoal/files/free-fire-coin-master_GM406889139.pdfIn PDF document text
    • https://e.mtsattaqwa10terpadu.org/__statics/gudangsoal/files/roblox-hack-client_GM431946152.pdfIn PDF document text
    • https://e.mtsattaqwa10terpadu.org/__statics/gudangsoal/files/how-to-install-minecraft-for-free-on-ios_GM479516143.pdfIn PDF document text
    • https://e.mtsattaqwa10terpadu.org/__statics/gudangsoal/files/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://e.mtsattaqwa10terpadu.org/__statics/gudangsoal/files/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://e.mtsattaqwa10terpadu.org/__statics/gudangsoal/files/roblox-cheating-tool_GM431946152.pdfIn PDF document text
    • https://e.mtsattaqwa10terpadu.org/__statics/gudangsoal/files/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • https://e.mtsattaqwa10terpadu.org/__statics/gudangsoal/files/free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://e.mtsattaqwa10terpadu.org/__statics/gudangsoal/files/free-robux-com-real_GM431946152.pdfIn PDF document text
    • https://e.mtsattaqwa10terpadu.org/__statics/gudangsoal/files/coin-master-hack-without-verification-for-iphone_GM406889139.pdfIn PDF document text
    • https://e.mtsattaqwa10terpadu.org/__statics/gudangsoal/files/coin-hackhub-coin-master_GM406889139.pdfIn PDF document text
    • https://e.mtsattaqwa10terpadu.org/__statics/gudangsoal/files/roblox-how-to-get-free-gamepasses_GM431946152.pdfIn PDF document text
    • https://e.mtsattaqwa10terpadu.org/__statics/gudangsoal/files/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://e.mtsattaqwa10terpadu.org/__statics/gudangsoal/files/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://e.mtsattaqwa10terpadu.org/__statics/gudangsoal/files/roblox-promocode-hacks-pastebin_GM431946152.pdfIn PDF document text
    • https://e.mtsattaqwa10terpadu.org/__statics/gudangsoal/files/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://e.mtsattaqwa10terpadu.org/__statics/gudangsoal/files/roblox-free-roblox_GM431946152.pdfIn PDF document text
    • https://e.mtsattaqwa10terpadu.org/__statics/gudangsoal/files/how-to-get-free-robux-without-download-apps-or-survey_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_002_off0000317a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x317A 23344 bytes
SHA-256: 62ffc38e1138030a8d1c73cb16ec795adc63588c5054ae54a6ae9a3a4a22b544
font_01_sfnt_off00006613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6613 19328 bytes
SHA-256: 38bb1ef0d1232593bc33faeb07ab7c9da97d5775ca686b5d0190a8681bcdbe68

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