Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead37cfde8dcb019…

MALICIOUS

PDF

34.1 KB Created: 2021-07-05 11:24:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 5e945e41988c8dcdfb284a0bd1479b42 SHA-1: 30f4d46f746fb0dfd82a1165af8449ba8c3d3906 SHA-256: ead37cfde8dcb019a3bf0b5abf10655254021aa22c2c19c361c27490b34050de
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external sites, many of which are hosted on a domain known for malicious redirectors. The document body and heuristics indicate a lure for game-related cheats and generators, aiming to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://netcdn.tw/app/406889139/coin-master-free-soins-game-hack In PDF document text
    • http://library.atim.ac.id/repository/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-online-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/cheats-for-phantom-forces-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-how-to-get-free-gear-2021_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/is-getting-free-robux-illegal_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/talk-as-someone-roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-fps-hack_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/installer-cheat-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-roblox-water-bottle-labels_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-make-shirts-for-free-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-hack-tool-2021_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-hack-app-ios-download_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/copy-paste-bin-1million-free-robux-script_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/get-free-robux-everyday_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-jailbreak-download-hack_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/hack-web-for-roblox_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_off000030c9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30C9 22624 bytes
SHA-256: d05f2eef1e424be3a8cf6d578b9bd3593fdc67f12cdaa2a73ddc15ff0aa15fab
font_01_sfnt_off00006380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6380 17996 bytes
SHA-256: f4306de497449c0c0250de5deec7b8066a87c54091f9de3abe5accc399ec3ddb

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