Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdfbb3ad513b11ea…

MALICIOUS

PDF

31.8 KB Created: 2021-07-07 01:45:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1e23e0f48650584ed08ead6da46a7ff5 SHA-1: d6dd9c440a799a011f3a02be74578d42961fef4f SHA-256: fdfbb3ad513b11ea097bad6cbbc502d92a434cc74fad003600927998382e1c90
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF employs a common lure of 'free Robux' and game hacks to entice users. It contains a link farm of numerous other PDFs hosted on external domains, likely serving as a distribution network for further malicious content or phishing attempts. The ML classifier strongly indicated maliciousness, and the PDF structure is indicative of a link-farming SEO scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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 http://netcdn.tw/app/431946152/free-robux-gift-card-codes-game-hack PDF link annotation
    • https://goodtools.tw/upload/files/test-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/easy-games-to-hack-on-roblox_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-views-on-tiktok_GM835599320.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/robux-pin-free_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-hack-dragon-ball-rage-roblox-2021_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-spins-ios_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-hacks-cheatscom_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/where-to-find-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-spins--spins_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-fog-remove-hack_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/coin-master-free-spins-twitter_GM406889139.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://goodtools.tw/upload/files/roblox-cheat-codes_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
font_00_sfnt_off00002931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2931 21196 bytes
SHA-256: d3541172480762f251ba09d6772a5257f898c58d2796815e9a9cad9863d6f7f1
font_01_sfnt_off0000573c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x573C 19112 bytes
SHA-256: a9b7dd84bf9e82aea66064645c2f0ef7c8831366a8baade96afcbb6aebc803c0

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