Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d4e897944b9090…

MALICIOUS

PDF

44.5 KB Created: 2021-05-14 09:05:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 73eb5cc03dc5cabb4a015bb84ad03984 SHA-1: f11abc2277fbf998d5b27b4d2431391a1213f0dc SHA-256: 45d4e897944b9090d38ba0c054169d9f6bbe41d31b86a7149d91ca83ae48df0c
182 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. It uses a fake-CAPTCHA lure. 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 0.9632

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 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.
  • 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
  • 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 https://netcdn.xyz/app/431946152/free-robux-accounts-2021-game-hack PDF link annotation
    • http://techmobil.pl/images/minecraft-linux-free_GM479516143.pdfIn PDF document text
    • http://techmobil.pl/images/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/free-robux-com-real_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/minecraft-free-games-no-download_GM479516143.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-make-a-server-in-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://techmobil.pl/images/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-free-spins-cheats_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-free-spins-today-new_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-free-coins-link-2021-deutsch_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/unlimited-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/hack-coin-pro-coin-master_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-hack-using-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047f3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47F3 24624 bytes
SHA-256: e63b62505eb44a8884890bfc9c69f558314391ef658464b570781126643dfa3c
font_01_sfnt_off000080cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80CB 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A7D 18520 bytes
SHA-256: 56624e41a965b33e02442574776651ebbc56d14fd3e4bfe95c3ae0db26e97c49

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