Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef47d64087e9abf…

MALICIOUS

PDF

37.0 KB Created: 2021-07-05 06:16:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7a77f9e2096ecf7db17183ba7a049ca9 SHA-1: ab7b2a971dc01f3b14bf1546500db07c82d25d60 SHA-256: 4ef47d64087e9abfb9978c4c8db4bf0e23f19421c1ab8e76ffde5ea92e35814b
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/coin-master-daily-free-spins-link-today-facebook-game-hack PDF link annotation
    • http://www.perpusffup.or.id/repository/free-robux-yoh-can-win-today_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/coin-master-hack-app-ios_GM406889139.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/coin-master-promo-code-2021_GM406889139.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/free-roblox-accounts-with-robux-2021-july_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/how-to-hack-games-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/roblox-google-shop-for-free_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/roblox-speed-change-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/coin-master-daily-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/free-fighting-roblox-game_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/app-store-games-free-download-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/give-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/free-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/coin-master-pc-hack-tool_GM406889139.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/how-to-watch-ads-for-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/free-roblox-shirt-templates_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_off00003705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3705 23316 bytes
SHA-256: 7ffffe8797d7bacb156b0f2469fa619ff8fc5507a447617c57ef66eea06f4538
font_01_sfnt_off00006b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B9F 19100 bytes
SHA-256: 10262a12b6a93a5eb401f2bda0e6b10a20895a2a64ebc159cb68bc6fd556a7cf

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