Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16450d2cadb6832…

MALICIOUS

PDF

48.2 KB Created: 2021-05-11 04:10:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6ebe8f9d673aa02d2fa03abad2613267 SHA-1: 11528b714b4c7a30f1825d441092cbd0fa84b430 SHA-256: d16450d2cadb6832f40aa97941e872aab45dcf5ee7f342922bfd12945cca5043
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a malicious redirector, specifically targeting users with lures related to game hacks and free generators. The embedded URL leads to known malicious infrastructure, and the document body, though heavily obfuscated, contains similar URLs. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8715

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.xyz/app/406889139/coin-master-70-spin-link-2021-game-hack In PDF document text
    • http://www.valenciamaids.com/userfiles/files/android-coin-master-3433-apk-hack_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/teach-me-to-hack_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/how-to-get-free-mods-in-minecraft_GM479516143.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/minecraft-116-apk-download_GM479516143.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/www-robux-us_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-rare-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-hack-without-verify_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/real-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/wurst-115_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a83.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A83 24124 bytes
SHA-256: 0696fbed9b8f286b77422c2160ba8651f7042b966b12af36fe1697e69308dfa5
font_01_sfnt_off000081b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81B6 4028 bytes
SHA-256: a17c2a746d49ac23b23e38a371e32fddecfcd91b10cf42ff6155bff6b8a07e91
font_02_sfnt_off00008f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F57 2788 bytes
SHA-256: 6fd7c7f447d66842f81aa8cf197935b17f22157d0c7e9f95622df1b5b4ddf530
font_03_sfnt_off00009947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9947 18348 bytes
SHA-256: 3aa27ca2b5074155a6d55c4a086f76437c73bbd8756faa1ee68498049c11f83f

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