Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4ea93dd387dab9…

MALICIOUS

PDF

43.9 KB Created: 2021-04-24 03:57:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 469c996a85dc7cb984631b1a0f15ff03 SHA-1: e9d7099b8b843a52d6d437fb4e362067230dcec1 SHA-256: 8b4ea93dd387dab997bf32ea26a6c358c7547073a6af16ea862090195f2dc54c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file 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 0.9868

Heuristics 4

  • 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://netsecure.top/app/431946152/free-robux-codes-for-robux-game-hack PDF link annotation
    • http://bwharrisalumniusa.org/images/roblox-all-free-items-2021.pdfIn PDF document text
    • http://bwharrisalumniusa.org/images/ccv3-cheats-for-roblox.pdfIn PDF document text
    • http://bwharrisalumniusa.org/images/roblox-crashes-when-cheat-engine-open.pdfIn PDF document text
    • http://bwharrisalumniusa.org/images/free-robux-games.pdfIn PDF document text
    • http://bwharrisalumniusa.org/images/how-to-hack-roblox-player.pdfIn PDF document text
    • http://bwharrisalumniusa.org/images/how-do-u-get-free-robux-on-iphone.pdfIn PDF document text
    • http://bwharrisalumniusa.org/images/free-robux-hack-us-com.pdfIn PDF document text
    • http://bwharrisalumniusa.org/images/how-to-get-free-thumbnail-in-roblox-studio.pdfIn PDF document text
    • http://bwharrisalumniusa.org/images/heroes-online-is-free-roblox.pdfIn PDF document text
    • http://bwharrisalumniusa.org/images/free-roblox-passwords-with-robux.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000429a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x429A 27984 bytes
SHA-256: 179b1ea83cfaeb698cd678335d3163c911959262e09b773830d232e1c68863d5
font_01_sfnt_off00008019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8019 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off000089db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89DB 18188 bytes
SHA-256: 7763b0eba74f003993d6ddc379ef756dfeeff7cedd1b34d70c41f8674d393ab3

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