Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b379ae406b4b81e…

MALICIOUS

PDF

48.0 KB Created: 2021-06-11 04:54:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 98fab9d4ce4789f74977a3ee4ff91c0e SHA-1: 4034710773c928cc99a8d565785610078787b6b3 SHA-256: 6b379ae406b4b81e95272d5f47271d30f4434e2b87d4b7c3ce5f5cebdc5f2002
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'generators'. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves luring users into clicking these links, likely leading to further malware downloads or phishing attempts.

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/i-hacked-it-roblox-piano-game-hack In PDF document text
    • http://lib.uho.ac.id/library//repository/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-download-wurst_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-currency-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-minecraft-java-edition-codes_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-hacks-xbox-one_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/freespins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-link-app-download_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-tips_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-working_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robux-online_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-minecraft-skin-maker_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-star-codes-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-pro_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-svg-free_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-roblox_GM431946152.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_off000050fc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50FC 25528 bytes
SHA-256: acc1334b6bcd3a84c47c859ff9d7c364803c96ad0b17c7ab551a1ae13b75eb9b
font_01_sfnt_off00008b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B95 3500 bytes
SHA-256: e49a868379cd3c37e631c5a53c010e21f38d803532a2b8417aee82315d4e8634
font_02_sfnt_off00009737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9737 18736 bytes
SHA-256: 0da6873e0717c9cb85c3eed802fcac3664df30f349bd9bcfeb5a7c3cc9269274

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