Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31a084e079190aa…

MALICIOUS

PDF

43.0 KB Created: 2021-05-17 00:00:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: f74e4447fd45a62d451415f6736f1bc2 SHA-1: 4586ce91b4420e662a9fdd9a62a68f403983ec4c SHA-256: e31a084e079190aa23a042c25516f2e4a8eb86c3f90b2dd251e5648ac050f9d0
160 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically advertising a 'free generator / game hack'. The embedded URL, https://netcdn.xyz/app/406889139/100-free-spins-on-coin-master-game-hack, likely leads to a malicious download or exploit. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the document's structure and embedded URL indicate a social engineering lure to trick users into executing a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/100-free-spins-on-coin-master-game-hack In PDF document text
    • https://datavoiz.com/images/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • https://datavoiz.com/images/robloxfun-com-robux_GM431946152.pdfIn PDF document text
    • https://datavoiz.com/images/coin-master-card-collection-hack_GM406889139.pdfIn PDF document text
    • https://datavoiz.com/images/minecraft-dungeons-free-download-pc_GM479516143.pdfIn PDF document text
    • https://datavoiz.com/images/coin-master-hack-without-verification-or-downloading-apps_GM406889139.pdfIn PDF document text
    • https://datavoiz.com/images/open-coin-master_GM406889139.pdfIn PDF document text
    • https://datavoiz.com/images/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://datavoiz.com/images/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://datavoiz.com/images/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • https://datavoiz.com/images/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • https://datavoiz.com/images/roblox-hack-client_GM431946152.pdfIn PDF document text
    • https://datavoiz.com/images/free-robux-discord_GM431946152.pdfIn PDF document text
    • https://datavoiz.com/images/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://datavoiz.com/images/free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://datavoiz.com/images/free-robux-quiz_GM431946152.pdfIn PDF document text
    • https://datavoiz.com/images/free-coins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • https://datavoiz.com/images/free-card-collection-in-coin-master_GM406889139.pdfIn PDF document text
    • https://datavoiz.com/images/rbx-free-robux_GM431946152.pdfIn PDF document text
    • https://datavoiz.com/images/robux-premium_GM431946152.pdfIn PDF document text
    • https://datavoiz.com/images/toolbox-premium-apk_GM479516143.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_off00004b73.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B73 26148 bytes
SHA-256: 707f9aec6a1f70e540f271b458fef1777a0412f0fe6fc98913b84a428465b439
font_01_sfnt_off0000860c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x860C 18164 bytes
SHA-256: bbb0863b6b56e230973ea45e87d56f99f1d326b285d23dffe78eb4756b106867

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