Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8e40b0ac892fc8…

MALICIOUS

PDF

32.8 KB Created: 2021-07-06 12:30:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 38fb5092b91e447512b5c85946c43135 SHA-1: 8da7d63bc9b6e3be3cd1025ef15d22ae7f025b14 SHA-256: 7d8e40b0ac892fc8328993eae6380c4c0cba407a7c9b6e3b304b2f55a61cf10c
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 0.9824

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/free-coins-coin-master-2021-game-hack PDF link annotation
    • https://key8013805.com.tw/upload/files/free-items-for-kids-on-roblox_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-roblox-gift-cards-2021-unused_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/yt-roblox-hacks-admin-commands_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/how-to-get-free-beautiful-hair-on-roblox_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/how-to-find-out-who-hacked-you-on-roblox_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/hack-roblox-weight-lifting_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-hair-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/how-to-fly-in-roblox-using-cheat-engine_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/real-robux_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/hacking-2-step-verification-for-roblox_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/how-to-setup-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-robux-generator-get-your-free-robux_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/funbloxxyz-free-robux_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
font_00_sfnt_off00002a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A25 22832 bytes
SHA-256: 0c1807810fbb193d70cfcd64e32c34a6da3bca7edd19dcf3fc09b443a9f10fb3
font_01_sfnt_off00005d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D5C 18400 bytes
SHA-256: 2a3e6040a3b782e95a9624477cdba266f2d22bc61ba2df799c05fa910d77e25c

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