Malicious PDF — malware analysis report

Static analysis result for SHA-256 e44d6252ec4e4e1d…

MALICIOUS

PDF

34.7 KB Created: 2021-05-22 21:35:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1240e329e4fe9d70eabbc0a7805850d6 SHA-1: f817ac81e452a05e952d3a37e08c274d2461e7d8 SHA-256: e44d6252ec4e4e1d435b37dae85eaa2d7649e0d7bbb91d77370c3b520f7b61ce
200 Risk Score

Malware Insights

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

The PDF contains multiple links to malicious redirectors, including one promising a 'free generator / game hack' for TikTok. The document body and heuristics indicate a social engineering lure to install a browser extension or download content, which is a common method for malware delivery. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/835599320/free-views-tiktok-game-hack In PDF document text
    • https://academy.cr/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://academy.cr/images/twitter-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://academy.cr/images/robux-download_GM431946152.pdfIn PDF document text
    • https://academy.cr/images/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • https://academy.cr/images/roblox-hack-unlimited-robux_GM431946152.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_002_off000031b0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31B0 23732 bytes
SHA-256: eb1bd4efb14b273b1feb3fb09f710b8ff2f05787ea78e8a27a309ca43de3c71f
font_01_sfnt_off00006781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6781 17752 bytes
SHA-256: ce4f969b492885a6292b68f2810015e61170a5a05df2656d5db0dd0870788c0b

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