Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d83dd2817d1c098…

MALICIOUS

PDF

35.5 KB Created: 2021-07-09 06:22:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d6483e96db489fabdb92c2f4eccae22a SHA-1: 21f9e4c600a082355349d694a750cce9d962cc6f SHA-256: 5d83dd2817d1c0985b167098e40771f1cdb0a0ddab252dae905c63881a271465
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/431946152/mobihack-net-roblox-hack-game-hack PDF link annotation
    • https://weddingcards-expert.tw/upload/files/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/good-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/free-robux-hack-com-no-human-verification_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/how-to-hack-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/how-do-u-hack-people-account-roblox_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/black-hair-roblox-free_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/daily-free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/roblox-download-pc-free_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/www-free-robux_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/free-robux-link_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/roblox-free-angel-wings_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/roblox-com-free_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/coin-master-heaven-daily-free-spins-and-coins-links_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/one-app-rewards-roblox-hack_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/minecraft-pe-017-0-apk-free-download-android_GM479516143.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/how-to-earn-robux_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/coin-master-free-coins-2021_GM406889139.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_off00003579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3579 21796 bytes
SHA-256: b5e385b00632c3e9f37bde5aa4a09fcb1983df75b03b82133db6b995a29766cd
font_01_sfnt_off0000654f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x654F 19244 bytes
SHA-256: 88e598bc89789b8ac21b9f126080391bbc9d3fa977fc33123edec0983ecad616

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