Malicious PDF — malware analysis report

Static analysis result for SHA-256 540387974e52a5ca…

MALICIOUS

PDF

51.3 KB Created: 2021-06-03 07:14:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a9690781a2c66aa9ccd52753037a9ebc SHA-1: 136524546421be8e1a58555012c41b7a2c8d2fe5 SHA-256: 540387974e52a5ca21f12a5412c60407296b6cbaba84debd33f54b02dd3eb7a0
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 0.9685

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.online/app/406889139/free-400-spins-coins-master-game-hack PDF link annotation
    • https://smark.com.tw/image/data/files/free-robux-apk_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-drop-master-free_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/como-hackear-coin-master-2021-espaol_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-website_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-free-outfits-on-roblox_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/pokemon-go-free-to-download_GM1094591345.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/sb-game-hacker-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-hack-app-ios-download_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-hack-unlimited-spins-apk-download_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/bp-to-uc-pubg_GM1330123889.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-spin-online-tool-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005242.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5242 27448 bytes
SHA-256: c3ae00c82fc23e7d594c6ca87a1fb4b841d313bc7fd501a275ed9451d41eec59
font_01_sfnt_off000091a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91A0 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00009b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B51 18120 bytes
SHA-256: 83d73b5d15900ebf4c8e8e4c37772eeea58eeced4667d8a4ec0d9f93b93c7b15
font_03_sfnt_off0000bce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE8 3264 bytes
SHA-256: e32c06502c11b52acb5e814091c5fdbffd1e2a904ac7a9cfb8b5b180bd139088

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