Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da949139ec7af25…

MALICIOUS

PDF

34.1 KB Created: 2021-06-19 06:19:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 578d3e5b13e81315d16b9cc3f015cbc2 SHA-1: ebc3818e915674c8c4b19366f747f9225ea2d71c SHA-256: 4da949139ec7af25a1627087c80753bfc095e3184dd09ea2c5c838db617f4544
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/431946152/unjailbreak-download-roblox-hack-game-hack PDF link annotation
    • http://armportal.co.uk/images/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/coin-master-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/god-mode-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/leah-ashe-roblox-royale-high-how-to-get-free-things_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/minecraft-marketplace-free_GM479516143.pdfIn PDF document text
    • http://armportal.co.uk/images/free-spin-coin-master-online_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/free-spins-for-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/how-to-play-coin-master_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/coin-master-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/como-ser-hacker-no-roblox-2021_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://armportal.co.uk/images/how-to-get-roblox-animations-for-free_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/roblox-upcoming-free-items_GM431946152.pdfIn PDF document text
    • http://armportal.co.uk/images/free-robux-hack-generator-no-survey-no-human-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E33 22480 bytes
SHA-256: 591f921ef30ac560ab22878d51ab3d3860b5070ae4d1c0a22a7d565725ef6d9d
font_01_sfnt_off0000600e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x600E 19468 bytes
SHA-256: 8d1c62ad258bae89060ca2974b2fbe18fda675f46c52a4421076bb036c4eaedd

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