Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9ed3808b861a7c…

MALICIOUS

PDF

44.5 KB Created: 2021-06-03 11:12:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7464a5bbf0741dd0f514b962a6ceb417 SHA-1: 1286baff8287fbf6833f10d144f4c990c5401602 SHA-256: 7b9ed3808b861a7cf39866d7c9b033295a8c92519b4f9bc3c0f3f027e757f0fd
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a fake CAPTCHA lure to trick users into clicking malicious links. The links lead to redirectors that host content related to game hacks and free item generators, indicating a phishing or scamming attempt. The document also contains numerous links to external PDFs, likely part of a link farm to improve SEO for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • 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.
  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.online/app/406889139/free-coin-master-spins-link-game-hack In PDF document text
    • http://suaedy-library.net/repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/roblox-free-item-codes_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/minecraft-hacks-xbox_GM479516143.pdfIn PDF document text
    • http://suaedy-library.net/repository/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-free-spins-app-for-iphone_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/minecraft-pocket-edition-download-free-pe-calculator_GM479516143.pdfIn PDF document text
    • http://suaedy-library.net/repository/roblox-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/can-you-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://suaedy-library.net/repository/free-free-robux_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-free-coins-and-spins-today_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/how-do-you-get-free-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-hacks-and-cheats_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/free-robux-hack-no-human-verification_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_004_off00005296.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5296 24960 bytes
SHA-256: 6c959011dc757bef5bc7d583027f22792fabb73e9d53a3162046db3117ce3e25
font_01_sfnt_off00008c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C05 18056 bytes
SHA-256: 3a13f115a00b8b7b194300b8b076c3bf70984f89fe406390bc378e2507b22e35

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