Malicious PDF — malware analysis report

Static analysis result for SHA-256 4604309f63d5fbb9…

MALICIOUS

PDF

34.3 KB Created: 2021-07-05 22:30:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7cb3ac565fceeaab88f61279d712586d SHA-1: 094f5fb23a821f3d8034756825f35350bca2eb36 SHA-256: 4604309f63d5fbb946f4709e56d6669530590a10a70a2e89966e94ad75a1cacd
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game currency and hacks to entice users. It contains numerous links to redirector infrastructure and a link farm of other PDF documents, many of which are hosted on 'educhina.mn'. The primary redirector URL is http://netcdn.tw/app/406889139/free-spins-and-coins-for-coin-master-game-game-hack. No scripts were extracted, but the document's structure and embedded links strongly suggest a phishing or scamming attempt, likely leading to further malware downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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/406889139/free-spins-and-coins-for-coin-master-game-game-hack In PDF document text
    • http://educhina.mn/editor/files/roblox-promocode-hack-2021_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-free-spins-and-coins-generator_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/how-to-roblox-noclip-hack-2021_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/roblox-robux-money-hack_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-for-pc-free-download_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/robux-hack-with-cheat-engine-64_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-spins-for-coin-masters_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/ban-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/how-to-hack-roblox-with-console_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/roblox-car-tycoon-hacks_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/static-moonactive_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
font_00_sfnt_off00002f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F5B 22704 bytes
SHA-256: 3c46eb9de91178aa256403b64b3d8d22ab1a2be1e1ddee9734bba6831f490d52
font_01_sfnt_off0000624b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x624B 18608 bytes
SHA-256: 31982f023cf9e8334e0247a56239ce43a369afef10c4502d97e5781750ca878f

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