Malicious PDF — malware analysis report

Static analysis result for SHA-256 5400a35aadca3668…

MALICIOUS

PDF

49.6 KB Created: 2021-06-04 04:44:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4a86d4c8d11d9c362dea2e9d043c8de8 SHA-1: 2e74019e9c6b390edfdc847a00c9160a736f53eb SHA-256: 5400a35aadca366846fc2721d01e2adc50c6eb0c8500faae987f89ec1fd2bf28
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to host SEO-optimized PDF files. The primary lure is 'free robux' or 'game hacks', indicating a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/431946152/freerobux-co-game-hack PDF link annotation
    • http://handimanlibrary.org/repository/free-coin-master-app_GM406889139.pdfIn PDF document text
    • http://handimanlibrary.org/repository/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://handimanlibrary.org/repository/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://handimanlibrary.org/repository/hack-robux-no-human-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://handimanlibrary.org/repository/working-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://handimanlibrary.org/repository/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://handimanlibrary.org/repository/free-spins-coin-master-links-twitter_GM406889139.pdfIn PDF document text
    • http://handimanlibrary.org/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://handimanlibrary.org/repository/coin-master-how-to-get-free-pet-food_GM406889139.pdfIn PDF document text
    • http://handimanlibrary.org/repository/coin-master-free-spins-ios-2021_GM406889139.pdfIn PDF document text
    • http://handimanlibrary.org/repository/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://handimanlibrary.org/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://handimanlibrary.org/repository/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://handimanlibrary.org/repository/hack-coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • http://handimanlibrary.org/repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://handimanlibrary.org/repository/free-robux-real_GM431946152.pdfIn PDF document text
    • http://handimanlibrary.org/repository/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://handimanlibrary.org/repository/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
    • http://handimanlibrary.org/repository/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://handimanlibrary.org/repository/safe-hack-for-coin-master-android_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5281 29304 bytes
SHA-256: ae88564161bef5fbe08c430ca0e586133da13011c72a4e706396e0dbd253cbf8
font_01_sfnt_off000095d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95D4 2948 bytes
SHA-256: 62d443219af91ade2b94394d70d85b9aaeed1c88df901a6d60edb9f35d694196
font_02_sfnt_off0000a00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA00A 18012 bytes
SHA-256: b26dee7669683be80ea9347b4d198a521f91968e5e17acfd13a86841c541343d

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