Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc0681cb8c096f3…

MALICIOUS

PDF

32.1 KB Created: 2021-07-01 04:09:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 06b0053b1731398c2ecdec1588aad80e SHA-1: c4226c45b4bcd0ac48254d4b40c19ad3b0b7f8c5 SHA-256: 5bc0681cb8c096f32d304b12c3cda4a5b02946ceb7eabc8cf050733211c91018
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

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 0.9824

Heuristics 6

  • 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 link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.co/app/406889139/coin-master-real-hack-game-hack PDF link annotation
    • https://limebug.com/media/storage/editor/files/cute-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/minecraft-free-exe_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-hack-app-ios_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/tiktok-free-folowers-joker_GM835599320.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/wurst-commands_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/jailbreak-roblox-hack-dll_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/why-you-never-want-to-use-free-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/copy-paste-bin-1million-free-robux-script_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-robux-hack-2021-no-human-verification-pc_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/freespinandcoinblogspotcom-2021-11-coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/www-free-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/spins-gratis-coin-master-hoy_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-codes-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/cheat-item-book-in-roblox_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-coins-coin-master-blog_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
stream_001_off00002aa5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2AA5 22136 bytes
SHA-256: 5c9f3539cf8d63872c2dfe89ad0a0460f329c41d67906711cb792b8e973a9aca
font_01_sfnt_off00005b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B9A 18080 bytes
SHA-256: ecaa553bbc3bb0be3309ebcef64813697d93a2640435283d6d3ff843f546506a

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