Malicious PDF — malware analysis report

Static analysis result for SHA-256 497365e6059ae750…

MALICIOUS

PDF

50.1 KB Created: 2021-06-03 22:05:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 62866a5d312db5c99bad1d94348ab715 SHA-1: 552bdca2aa45c0fd4898ee27f7327fbd2b64650e SHA-256: 497365e6059ae75087e4dcd2112742a48b33422f087b8b544cb08fc61add44b8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links directing users to websites offering game hacks and free items, indicating a social engineering lure. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially malicious infrastructure for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9734

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.online/app/406889139/unlimited-spin-coin-master-hack-game-hack In PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-roblox-generator-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-free-download-ipad_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/my-minecraft-account-was-hacked_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-hax_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-roblox-intros_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/facebook-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-net_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/spin-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-tiktok-hearts_GM835599320.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-free-download_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-app-2021_GM431946152.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_004_off00004feb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FEB 24744 bytes
SHA-256: ad57e5175ae8e19442713c567bfb42932f3fc8ca141c0d99d87f73a8d1a60697
font_01_sfnt_off00008854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8854 4092 bytes
SHA-256: c42ddc52594bb1b1147f846c126bf170ce8763f7029b88f31e537a748176ead9
font_02_sfnt_off00009630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9630 2788 bytes
SHA-256: 6fd7c7f447d66842f81aa8cf197935b17f22157d0c7e9f95622df1b5b4ddf530
font_03_sfnt_off0000a020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA020 18584 bytes
SHA-256: ae98b113e243a6dee09af4228d4dcf65a32797416eb214c6eaedfd928d742d84

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