Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca72b14a71bd9cd…

MALICIOUS

PDF

34.2 KB Created: 2021-07-07 14:58:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7565837bfde54f9903a6ff4dc1778092 SHA-1: fc2f7872a58c7e45ab089766f17b2c58f5ff33d1 SHA-256: 7ca72b14a71bd9cdcf5265fec7a6e0fffe21ac9387b7b212e6e9c6faf61051f0
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/how-do-you-earn-free-coins-for-coin-master-game-hack PDF link annotation
    • https://www.dotnotion.com/uploaded_files/userfiles/files/toolbox-for-minecraft-pe-ios_GM479516143.pdfIn PDF document text
    • https://www.dotnotion.com/uploaded_files/userfiles/files/speed-hack-for-all-games-roblox_GM431946152.pdfIn PDF document text
    • https://www.dotnotion.com/uploaded_files/userfiles/files/how-to-get-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.dotnotion.com/uploaded_files/userfiles/files/best-roblox-outfits-for-free_GM431946152.pdfIn PDF document text
    • https://www.dotnotion.com/uploaded_files/userfiles/files/filter-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://www.dotnotion.com/uploaded_files/userfiles/files/how-to-get-free-robux-in-roblox-without-a-generator_GM431946152.pdfIn PDF document text
    • https://www.dotnotion.com/uploaded_files/userfiles/files/how-to-use-cheat-engine-63-on-roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://www.dotnotion.com/uploaded_files/userfiles/files/roblox-data-breach_GM431946152.pdfIn PDF document text
    • https://www.dotnotion.com/uploaded_files/userfiles/files/master-coin-hack-app_GM406889139.pdfIn PDF document text
    • https://www.dotnotion.com/uploaded_files/userfiles/files/coin-master-hack-without-downloading-apps_GM406889139.pdfIn PDF document text
    • https://www.dotnotion.com/uploaded_files/userfiles/files/coin-master-hack-app-link_GM406889139.pdfIn PDF document text
    • https://www.dotnotion.com/uploaded_files/userfiles/files/how-to-hack-a-roblox-gamw_GM431946152.pdfIn PDF document text
    • https://www.dotnotion.com/uploaded_files/userfiles/files/is-minecraft-free-on-mac_GM479516143.pdfIn PDF document text
    • https://www.dotnotion.com/uploaded_files/userfiles/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.dotnotion.com/uploaded_files/userfiles/files/roblox-inspect-consle-hacks_GM431946152.pdfIn PDF document text
    • https://www.dotnotion.com/uploaded_files/userfiles/files/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • https://www.dotnotion.com/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://www.dotnotion.com/uploaded_files/userfiles/files/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • https://www.dotnotion.com/uploaded_files/userfiles/files/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • https://www.dotnotion.com/uploaded_files/userfiles/files/minecraft-pocket-edition-free-download_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
font_00_sfnt_off0000307a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x307A 22376 bytes
SHA-256: 3933d3a3eb2fcf3f689c993fee03ee358e3a6285be72edcef5a98fb9e6e0f31d
font_01_sfnt_off0000621e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x621E 18632 bytes
SHA-256: 5f4a2f9d58bef6d8ec5d835dd7005a81d6886bc92a10ece532c5e53e77dc27b5

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