Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b248d1782ea7e05…

MALICIOUS

PDF

34.4 KB Created: 2021-07-05 07:47:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c6d87a524523b802055a04900f1007b1 SHA-1: d44f8263ade5dbb30b2053e989a14ab0f61ab05f SHA-256: 5b248d1782ea7e054f6fa4ce5dbf92bf1631bcec28c8713bdf71cabe6fcfffa3
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are SEO-optimized PDFs related to game hacks and free currency generators. The primary lure appears to be 'Coin Master' free spins, with a direct link to a suspicious URL on netcdn.tw. The document's structure and content strongly suggest a phishing or scam attempt designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/406889139/get-more-free-spins-on-coin-master-game-hack PDF link annotation
    • http://library.umuslim.ac.id//repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/pubg-uc-2021_GM1330123889.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-robux-pc-2021-not-patched_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/coin-master-update-2021_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-roblox-account-hacker_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-roblox-gift-card-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/press-one-button-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-minecraft-server-hosting-with-plugins_GM479516143.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-do-you-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/roblox-free-redeem-card_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/coin-master-daily-link_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-do-you-earn-robux_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/btools-hack-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/roblox-hack-2021-online-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-to-hack-coin-master-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/free-roblox-hack_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_002_off00003070.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3070 23000 bytes
SHA-256: e1b787afd45dec42a31a08298af5ae02ca10ba6014febfd778239378cffe07ac
font_01_sfnt_off00006413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6413 18176 bytes
SHA-256: 4fd6d1aceac6cebacd30cf875f8d613d9461a91834818942a997ff440641441e

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