Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd979c437e54c84e…

MALICIOUS

PDF

40.5 KB Created: 2021-05-19 20:01:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3db360b5da9c34df94b59b2139630aee SHA-1: cbdb767bc772421401e1d0b6ec5b2d0006a6bbc8 SHA-256: bd979c437e54c84e4404c5bb7f3ae95772ac7fb56de46c8cec9110d91340a863
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 0.9971

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://netcdn.xyz/app/1330123889/pubg-uc-generator-without-verification-game-hack PDF link annotation
    • https://goodtools.tw/upload/files/roblox-heroes-online_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-card-link-coin-master_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-roblox-toy-codes-2021_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/minecraft-pocket-edition-hack_GM479516143.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/www-rbx-com_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-game-hack-online_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-new-link-free-spin_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-minecraft-maps-pe_GM479516143.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-coins-link-facebook_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/minecraft-free-online_GM479516143.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-hack-apk_GM406889139.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_off000042a3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x42A3 24128 bytes
SHA-256: 33b08bebcb728bfc0c9d258d82d24e3fcf3fc47fd92dde9368aa4c6d89a3811e
font_01_sfnt_off0000797a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x797A 18988 bytes
SHA-256: 03b3f2549f059d7b1437438796a6ad0ed8cc13fa8205b1b3b0eab06f7ef1ca4f