Malicious PDF — malware analysis report

Static analysis result for SHA-256 343320082b1e3a64…

MALICIOUS

PDF

44.0 KB Created: 2021-06-11 00:02:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 870b9e2414b7904aadd58ec6d2d67c05 SHA-1: 1860168f97ec779688b0806977b308feb355f971 SHA-256: 343320082b1e3a64cf93d754a854003855bfdeb9eb23eac5000af0cd9fec4959
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 0.9865

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.tw/app/431946152/how-to-get-robux-fast-for-free-game-hack PDF link annotation
    • http://mountain.mn/uploads/files/free-roblox-app_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/minecraft-ps4-free_GM479516143.pdfIn PDF document text
    • http://mountain.mn/uploads/files/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/static-moonactive-net-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-roblox-scripts_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://mountain.mn/uploads/files/pokemon-go-free-coins-no-survey_GM1094591345.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/how-to-ranks-up-in-a-roblox-group-hack-easy_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://mountain.mn/uploads/files/coin-master-free-spins-and-coins-for-today_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/coin-master-fun-hack_GM406889139.pdfIn PDF document text
    • http://mountain.mn/uploads/files/roblox-land-free-robux_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
stream_004_off00004fc7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FC7 24568 bytes
SHA-256: 0ad0425889c1b0202ebd4b49571d3028d3670faeb4c6ccdf647f12c7085fa689
font_01_sfnt_off00008856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8856 18512 bytes
SHA-256: 7a4c1c31fc2f6594a1994f5d8d5eb32c46285fc70fba7ddde177117bdc404827

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