Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c538ad344b0725…

MALICIOUS

PDF

43.5 KB Created: 2021-05-12 01:36:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f81aafe7f70681f8a600ade7a2d3fd08 SHA-1: d82672f22bb809881367fa4bb4e5887111bdcf9a SHA-256: f1c538ad344b072598d759cef3838777abf6c7a07d45a272d4da27bab20e0ee2
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 0.9969

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-roblox-groups-game-hack PDF link annotation
    • http://www.manchieu.vn/upload/editor/files/how-to-get-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/coin-master-34-4-hack-download_GM406889139.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/coin-master-mod-apk-unlimited-spin-download-free-full-version_GM406889139.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/coin-master-hack-ios-without-verification_GM406889139.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/roblox-free-models_GM431946152.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/safe-hack-for-coin-master-android_GM406889139.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/gamehunters-coin-master_GM406889139.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/password-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/rich-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4911 27404 bytes
SHA-256: b97bbe8841403fe4aaaa9b14adb1339eacbd1aa56b326be5b377dcced6d393ce
font_01_sfnt_off000087a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87A1 18264 bytes
SHA-256: 59dbfb19f503ab5ccde5afb48b0ebb207c820587c290c946a9c33262b394e3ff

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