Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b66408aaf80e7d…

MALICIOUS

PDF

35.1 KB Created: 2021-06-27 23:36:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 132384001347e07e8b4b331be2177fb9 SHA-1: abe75bf2ed5a6dee470b23f6a47a0e1f93a49230 SHA-256: 37b66408aaf80e7de10eb7e2584d3f2d3bdfa699404be62737552baedb9feb9b
142 Risk Score

Malware Insights

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

This PDF document employs a common lure of 'free game hacks' and 'promo codes' to entice users into clicking embedded links. The document contains a large number of external links, many of which point to other PDF files hosted on similar domains, suggesting a link farm or redirector infrastructure. The primary goal appears to be driving traffic to potentially malicious websites or facilitating the download of unwanted software.

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.co/app/431946152/how-to-get-promo-codes-robux-free-202100-game-hack PDF link annotation
    • http://global-brand.net/userfiles/files/how-to-get-free-robux-roblox-2021_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-roblox-account-with-2021-robux_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/coin-master-free-account_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-coin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/play-minecraft-online-free_GM479516143.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/android-coin-master-3433-apk-hack_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/coin-master-free_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-robux-hack-computer_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-to-buy-robux-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/no-scam-free-robux_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_off00002fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FB1 22268 bytes
SHA-256: 74d55fcf28a719facc0fdfc1b3814f94348d184784bae507f748302f233ef218
font_01_sfnt_off00006138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6138 19976 bytes
SHA-256: 7eee6ec77dfa0d260502d2d06e32787ec37048b9d1e87314617ac5cdee31fbba

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