Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef95bc567b88e46…

MALICIOUS

PDF

43.3 KB Created: 2021-05-12 13:07:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3112d4261b4205bf3634c8f2423e3b9e SHA-1: e408f8f299e6df8b5632fca068f4500310059255 SHA-256: 8ef95bc567b88e4676743864a6c68f42c7d9f0b854988ca0c1b64194707c25b8
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, 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 0.9969

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 https://netcdn.xyz/app/431946152/free-robux-without-human-verification-game-hack PDF link annotation
    • https://ezgolfer.com.tw/image/data/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/free-robux-cards_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/coin-master-hack-apk-facebook-login_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/blogspot-coin-master_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/free-spins-coin-master-ios-links_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/coin-master-free-food_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/ac-market-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/hack-coin-master-apk-32_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/fbchampion-com_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004767.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4767 25796 bytes
SHA-256: 5ac945371da319b0699c8a7573ddbeec4eb2f0f43747ed02d3b45e439a560dd7
font_01_sfnt_off00008412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8412 19224 bytes
SHA-256: 69162c0303826e3a88150cee7b6b12b50ba56e04bc46253c0e5eb9f80ac8a399

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