Malicious PDF — malware analysis report

Static analysis result for SHA-256 3635b3a7a3f2975b…

MALICIOUS

PDF

35.0 KB Created: 2021-07-04 07:40:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 76778da31689e29d6375bbdcf672e6e4 SHA-1: 18de5b3fb6adc8d3b562559c5e56665d0ff7ea6c SHA-256: 3635b3a7a3f2975bbb25ec1425ca6d04268ed3b92a7678318828c1a130da94d1
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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/spins-gratis-coin-master-hoy-game-hack PDF link annotation
    • https://vieclamjapan.com/upload/files/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/buy-robux-free_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/is-minecraft-free-on-computer_GM479516143.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-headless-head-roblox_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/cherry-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/coin-master-lucky-patcher-hack_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-haiir-roblox_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/roblox-hack-stage-samim-sinim-youtube-aid_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/games-like-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/skrillix-wolf-roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-roblox-gear_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/cheat-codes-for-candy-treasure-quest-on-roblox_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/pastebin-roblox-accounts-hack_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-printable-roblox-coloring-pages_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-roblox-codes-for-robux-bc_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-robux-not-fake_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_off00003278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3278 23128 bytes
SHA-256: 23a913738385bee8a655d646dc5b6c66f11b615f31f4912d40f8f48a6e5df5fa
font_01_sfnt_off00006682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6682 18192 bytes
SHA-256: f0cb3e5f4dfe88bc40a90a65ebd818d218d5edb4fbfdc9be9603a0c52878bb4f

Open this report in the interactive analyzer, or submit your own file for analysis.