Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e379d378b9bede…

MALICIOUS

PDF

45.7 KB Created: 2021-05-16 05:04:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 69bd0407cf3f348cc383236afafdb096 SHA-1: 806c20a10f57d4f8cec79a2139125de8d6e22c29 SHA-256: 77e379d378b9bede35a227b9c6a91de57770ff11c9eacfa2843eeb9c46f569d5
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 https://netcdn.xyz/app/431946152/free-admin-roblox-game-hack PDF link annotation
    • http://musestravel.com/images/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://musestravel.com/images/coin-master-hack-tool-exe_GM406889139.pdfIn PDF document text
    • http://musestravel.com/images/coin-master-hack-mod-apk-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://musestravel.com/images/coin-master-free-spins-deutsch-download-2021-link_GM406889139.pdfIn PDF document text
    • http://musestravel.com/images/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://musestravel.com/images/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://musestravel.com/images/robux-today_GM431946152.pdfIn PDF document text
    • http://musestravel.com/images/coin-master-hack-without-human-verification-india_GM406889139.pdfIn PDF document text
    • http://musestravel.com/images/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://musestravel.com/images/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://musestravel.com/images/free-roblox-clothes-for-your-avatar_GM431946152.pdfIn PDF document text
    • http://musestravel.com/images/roblox-arsenal-hacks-download_GM431946152.pdfIn PDF document text
    • http://musestravel.com/images/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://musestravel.com/images/coin-master-daily-free-cards_GM406889139.pdfIn PDF document text
    • http://musestravel.com/images/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://musestravel.com/images/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://musestravel.com/images/how-to-get-free-shirts-on-roblox_GM431946152.pdfIn PDF document text
    • http://musestravel.com/images/minecraft-apk-114-4_GM479516143.pdfIn PDF document text
    • http://musestravel.com/images/free-pet-food-for-coin-master_GM406889139.pdfIn PDF document text
    • http://musestravel.com/images/robux-hack-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
stream_003_off00004877.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4877 32244 bytes
SHA-256: 6e5149583f03873c9aefee296fd3c2a0d67debde651423e2bbdd5254093d40e5
font_01_sfnt_off00008fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FE0 18504 bytes
SHA-256: 830d3dec1a52b5677d0ce8f7274f803060246143ae3edd9314b7ddd4a581007c

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