Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a214e0ede2e8a3…

MALICIOUS

PDF

32.9 KB Created: 2021-07-05 23:23:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5c38c0da5827c632fa530cf6dcd7a04f SHA-1: 726add7b1de8b3a5e3d8be106140852b9352d4f5 SHA-256: 21a214e0ede2e8a38379f6fe163652f4458d0836607a9bb96e8fdabcae4084f0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector leading to a 'free generator / game hack' lure. The ML classifier also flagged this PDF as malicious. The document body, though truncated, contains similar URLs, reinforcing the lure to click on 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/479516143/minecraft-free-game-hack In PDF document text
    • https://www.knjiznica-oroslavje.hr/files/pubg-uc-uk_GM1330123889.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-roblox-accounts-with-1-million-robux_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-tiktok-fans-app_GM835599320.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/dominus-roblox-free_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/roblox-play-as-guest-free_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/rbx-sites_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/how-to-hack-roblox-to-get-admin-commands_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/pubg-uc-midasbuy-pakistan_GM1330123889.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-clothes-roblox-groups_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/easy-way-to-hack-robux_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-roblox-accounts-2021-august_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-blank-roblox-shirt-templates_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/tiktok-free-views_GM835599320.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_off00002ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EA4 21980 bytes
SHA-256: 3be0146484900384a006211bffcabe52a269345778096e17d9f8d5df84cd60b7
font_01_sfnt_off00005f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F09 17856 bytes
SHA-256: cc1e3add4a04a98446b1b55314af2162444863ccaf169a3449495116b9daf471

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