Malicious PDF — malware analysis report

Static analysis result for SHA-256 c451a48e66fd4252…

MALICIOUS

PDF

44.1 KB Created: 2021-05-11 14:07:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 983ad5453296b307345c9cb5ebfcf7dc SHA-1: 73c7dde4343eb22a5cb8a6c6876ea24a1d5c891c SHA-256: c451a48e66fd4252b5a6557b740206f67ecacd0b3639e49a4d5bd80dbcc34b8a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple embedded URLs that redirect to a malicious website, likely a scam or phishing page, disguised as a game hack generator. The ML classifier strongly flagged this PDF as malicious, and heuristic rules indicate it's a redirector lure. No scripts were extracted, but the document structure and embedded URLs suggest an attempt to trick the user into visiting a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/431946152/free-robux-without-human-verification-2021-game-hack In PDF document text
    • http://egorplitka.ru/images/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://egorplitka.ru/images/free-coins-2021-coin-master-link_GM406889139.pdfIn PDF document text
    • http://egorplitka.ru/images/mcpe-master-hack-unlimited-coins-apk_GM406889139.pdfIn PDF document text
    • http://egorplitka.ru/images/coin-master-unlimited-spin-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://egorplitka.ru/images/roblox-robux-page_GM431946152.pdfIn PDF document text
    • http://egorplitka.ru/images/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://egorplitka.ru/images/coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • http://egorplitka.ru/images/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://egorplitka.ru/images/free-robux-com_GM431946152.pdfIn PDF document text
    • http://egorplitka.ru/images/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://egorplitka.ru/images/is-minecraft-free_GM479516143.pdfIn PDF document text
    • http://egorplitka.ru/images/get-more-robux_GM431946152.pdfIn PDF document text
    • http://egorplitka.ru/images/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://egorplitka.ru/images/coin-master-hacks-for-iphone_GM406889139.pdfIn PDF document text
    • http://egorplitka.ru/images/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://egorplitka.ru/images/master-game_GM406889139.pdfIn PDF document text
    • http://egorplitka.ru/images/free-robux-co_GM431946152.pdfIn PDF document text
    • http://egorplitka.ru/images/roblox-arsenal-hacks-download_GM431946152.pdfIn PDF document text
    • http://egorplitka.ru/images/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://egorplitka.ru/images/moonactive-coin-master-free-spins_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
stream_003_off000048af.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48AF 26616 bytes
SHA-256: e78dc3f667cd05ec87ad043c8ec8593f550299baa8a913d9f876e0757643cd98
font_01_sfnt_off000085fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85FB 19624 bytes
SHA-256: 5c907f8fc0171ac382cbe47737dfe307495a07ea2f2097b2a41ed37680731fb3