Malicious PDF — malware analysis report

Static analysis result for SHA-256 88dd32c324862216…

MALICIOUS

PDF

42.4 KB Created: 2021-05-12 16:05:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fd2342b159347874d07e70be64726de1 SHA-1: 11c971ed6f4bb44d6dea295aa9ff2df984f0132b SHA-256: 88dd32c3248622162af4c7291be1a0dd68cf69f412f398dd25d488cc185dd4e1
162 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a lure, presenting a fake CAPTCHA and download buttons to trick users into clicking links. The embedded URLs, such as 'https://netcdn.xyz/app/431946152/how-to-get-1-million-robux-for-free-2021-game-hack', promise free game currency or hacks, a common social engineering tactic. The ML classifier also flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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/how-to-get-1-million-robux-for-free-2021-game-hack PDF link annotation
    • http://ldjahorina.com/images/flame-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://ldjahorina.com/images/hack-to-protect-village-on-coin-master_GM406889139.pdfIn PDF document text
    • http://ldjahorina.com/images/free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://ldjahorina.com/images/mcpe-hacks_GM479516143.pdfIn PDF document text
    • http://ldjahorina.com/images/how-to-get-robux-fast_GM431946152.pdfIn PDF document text
    • http://ldjahorina.com/images/roblox-studio-free-download_GM431946152.pdfIn PDF document text
    • http://ldjahorina.com/images/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://ldjahorina.com/images/coin-master-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://ldjahorina.com/images/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://ldjahorina.com/images/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://ldjahorina.com/images/coin-master-free-spin-link-new_GM406889139.pdfIn PDF document text
    • http://ldjahorina.com/images/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://ldjahorina.com/images/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://ldjahorina.com/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://ldjahorina.com/images/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://ldjahorina.com/images/wurst-115_GM479516143.pdfIn PDF document text
    • http://ldjahorina.com/images/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://ldjahorina.com/images/minecraft-maps-pe-free-download_GM479516143.pdfIn PDF document text
    • http://ldjahorina.com/images/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • http://ldjahorina.com/images/freespinandcoinblogspotcom-2021-11-coinmasterfreespinandcoinlinkshtml_GM406889139.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
stream_003_off000047fe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47FE 24780 bytes
SHA-256: 9bde3d2f9a204a65aef9db8ca7883539ee0275b3468bfdae4aaf633a6c9366d3
font_01_sfnt_off0000811e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x811E 19072 bytes
SHA-256: 6899649986c08cd88da4e8ab8a55ee52e34bf21c69bba097983649bb28a6798f

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