Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f493a3c9c58c2c…

MALICIOUS

PDF

34.8 KB Created: 2021-07-04 12:53:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 63b84d0f92cbf5713764c268005b9e21 SHA-1: 214f1f915fec74fcc751b09b661154c54ee14b5f SHA-256: 86f493a3c9c58c2c72a19cf736dadeb37783298940bc8341487a60febaf34cc9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to a lure for 'Coin Master Free Daily Spins'. The document body also contains this URL, reinforcing the social engineering attempt. The ML classifier also flagged this PDF with high confidence. While no scripts were extracted, the embedded URL is the primary indicator of malicious intent, likely leading to a phishing or malware download site.

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-daily-spins-game-hack In PDF document text
    • http://library.yamasi.ac.id//repository/tiktok-free-pictures_GM835599320.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/pastebin-hack-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-spins--coins-2021_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/tiktok-free-search_GM835599320.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-get-free-robux-on-iphone-5_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/spin-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-cheat-engine-feb-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/minecraft-client_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/pokemon-go-free-games-online_GM1094591345.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-jailbreak-money-hack-december-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-roblox-accounts-with-robux-2021-march_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-jailbreak-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/moonactive-free-spins-link_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-get-free-robux-just-by-downloading-apps_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/no-robux_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
stream_002_off0000319d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x319D 22672 bytes
SHA-256: 6729d404494ba3fc023eac45c63ea500b81489266c7d0bbcb5df0b88d162915c
font_01_sfnt_off0000644e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x644E 18596 bytes
SHA-256: 9cc88ea50ead10f9f912dbf4be3878b8b313467d4147098bf597ecbc2abb3a30

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