Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba20b344dab46e7…

MALICIOUS

PDF

43.4 KB Created: 2021-05-18 03:04:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 80a36e3dfe5712e50e72afda1123cf3c SHA-1: 9027c6191e29902047ecc02d941afd5fcadb2ea0 SHA-256: dba20b344dab46e7513ba471ecb008d9fd3715271a632ecd5a7cdc77941355a9
200 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into clicking a link, which is a common tactic for phishing or malware distribution. The embedded URL leads to a known malicious redirector infrastructure. While no scripts were directly extracted, the PDF structure and heuristics suggest it's designed to exploit user interaction, likely leading to a second-stage download or redirection to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/robux-gratis-game-hack In PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/free-coins_GM406889139.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/coin-master-mod-apk-2021_GM406889139.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/hack-coin-master-ios-download_GM406889139.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/free-roblox-usernames-and-passwords_GM431946152.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/hacker-coin-master_GM406889139.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/coin-master-today_GM406889139.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/coin-master-hack-cheat-engine_GM406889139.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/free-game-packs-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/20210-robux_GM431946152.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/coin-master-hack-version-ios_GM406889139.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/coin-master-card-collection-link_GM406889139.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/free-coins-2021-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://www.furuihp.com/Public/upload/editorfiles/free-coin-master-glitches_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_off00004b82.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B82 26252 bytes
SHA-256: 4599f05d82ff3d0dffcceb9fae0cb041609fe62eff9977ceab106e37670cb069
font_01_sfnt_off00008726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8726 18300 bytes
SHA-256: 5b7956b367e7034c1d89c4bcafd3a8b19a23372aa7741d4527a1b7b8c092ce2f

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