Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6f8cff2ee99d0f…

MALICIOUS

PDF

44.1 KB Created: 2021-06-04 05:11:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 296744ccf30f7a64640a051ed137d92c SHA-1: 366e73cc173624a7841696bfc9b49db6b5444bd6 SHA-256: af6f8cff2ee99d0f19f66d0cf3bbb2d9a2cb4a6cc1f0f7940fc750f4742183f2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to a 'free generator / game hack' lure. The document body, though partially corrupted, contains text related to 'Free Spins And Coins Coin Master Links' and a URL that aligns with the heuristic findings. This indicates a phishing attempt designed to trick users into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/free-spins-and-coins-coin-master-links-game-hack In PDF document text
    • https://www.bridalguide.com/sites/default/files/files/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/robux-boost_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/free-robux-safe_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/give-free-robux_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/coin-master-app-free-download_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/minecraft-for-free-apk_GM479516143.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/daily-coin-master-free-spin-apk_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/free-shields-coin-master_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/play-minecraft-free-online-no-download_GM479516143.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/roblox-cp_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/coin-master-free-pet-snacks_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/coin-master-free-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/free-minecraft-account-list_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_004_off0000528d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x528D 24152 bytes
SHA-256: db990a9e78aa001ae455bc52a1b6e5002f41de82ff48f2187b0496500260b324
font_01_sfnt_off00008a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A1D 18228 bytes
SHA-256: 69b56589237c96fdda83d18de15f7bb650a68c91d961ede8b08ce7eda2bec3b9

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