Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4405096e8bd9b15…

MALICIOUS

PDF

33.1 KB Created: 2021-07-04 17:13:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 1955008ccc6fb8d8ca0afda6e7ec6451 SHA-1: 1480b50e33350f283db41e5c9dfebb0596ff8200 SHA-256: d4405096e8bd9b15f849cfc5aa1c7619b04dc4195a93a3afde8e0cbae6d50f62
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links designed to lure users into clicking on them by promising free Robux or game hacks. The primary link, http://netcdn.tw/app/431946152/free-robux-accounts-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the document's structure and embedded URLs suggest an intent to redirect users to potentially malicious websites, likely for phishing or malware distribution.

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/free-robux-accounts-game-hack In PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-free-spins-deutsch-download-ios-link_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/i-need-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/www-roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-time-speed-hack_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-aim-hack_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-fun-hack-online_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/cool-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/how-to-get-minecraft-windows-10-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-latest-mod-apk-free-download_GM406889139.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_off00002f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F2B 21932 bytes
SHA-256: 373ef04e3939be0c163b0b858e178de4b59111d0d38322383a31e31e05aa32f6
font_01_sfnt_off00005f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F68 18820 bytes
SHA-256: 9247447a3c3765c463ad34d06656dabe45291e7d100ded84caf3f858f3985503

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