Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b64d4659dac008d…

MALICIOUS

PDF

35.4 KB Created: 2021-07-06 01:20:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 41904a248927ec2611bcfd90f3afac0e SHA-1: ac9ff24afec7304293aab44410cfb5428343d3cb SHA-256: 6b64d4659dac008d45a0137656f18854bdbc5c619a8130d6333a1679a731bf75
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of free in-game items. The primary malicious URL identified is http://netcdn.tw/app/406889139/coin-master-free-2021-spin-link-today-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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-2021-spin-link-today-game-hack In PDF document text
    • https://fib.ub.ac.id/sac/repository/run-free-roblox-id_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/boss-get-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-hack-apk-with-fb-login-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/tiktok-free-like-and-views_GM835599320.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/roblox-hack-client_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-animation-packs_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/robux-websites-that-work_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-any-hat-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/promo-code-roblox-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-with-inspect-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/claim-gg-earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-animations_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-spins-free-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/can-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-free-spin-link-today-50_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-currency_GM431946152.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
font_00_sfnt_off000030f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30F3 23084 bytes
SHA-256: bbd4aaa607f7197427f4737f6b03d58a00207acf186f1c6b4604d338f5f97acd
font_01_sfnt_off00006504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6504 19100 bytes
SHA-256: 827fa8b7f69ea23430b11d0a5a0138b83120a1107722004eca5be2f5cbc76a94

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