Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51201881b15c0b2…

MALICIOUS

PDF

35.5 KB Created: 2021-07-03 12:06:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f13c323de799879a926370e8a41c395b SHA-1: 6a9c19f4c87f2ddccf5452bf6294d3a7bbba395b SHA-256: d51201881b15c0b2fcec19d990c5681834327e8fd7f5b0fd1deb82247e16542f
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external sites, many of which are part of a link farm designed to lure users with promises of game hacks and free resources. The primary redirector URL, http://netcdn.tw/app/406889139/coin-master-free-spins-no-generator-game-hack, is flagged as malicious. The document's structure and content strongly suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

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/coin-master-free-spins-no-generator-game-hack In PDF document text
    • https://dentmate.com.tw/image/data/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-links-that-don-t-expire_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/roblox-murderer-mystery-2-gem-cheats_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/a-roblox-hack-to-get-all-money-in-jailbreak_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/conquerors-roblox-cheats_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-unlimited-spin-hack-mod-apk_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/robux-game-free_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/links-to-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/how-to-get-free-robux-using-your-phone_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coinmasterfreespinlink_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/logo-roblox-cafe-gfx-free_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/cheat-gg-roblox-ninja-legends_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/how-to-recover-your-hacked-roblox-account_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/how-to-hack-atm-in-emergancy-response-roblox_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-roblox-skin-codes_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-hack-coins_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_002_off00003502.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3502 23004 bytes
SHA-256: 2c14f4f841c1a4d381b01d7256b5d19902039737aeee5e7b8f8ccfb9db1a8d9d
font_01_sfnt_off00006862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6862 18176 bytes
SHA-256: 77c96ce1f1240076ebae8e0b9f71290cf4df32d1dbcc09d34a4bb131e3b5cb60

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