Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a85887e08984a4…

MALICIOUS

PDF

34.2 KB Created: 2021-07-08 07:49:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 64cfef841ea03141ac15948d4259e9dc SHA-1: 0f10014e9cf86e1b0a0776986a972e1080291449 SHA-256: c1a85887e08984a4c5c5cfaada5c649390b4d0b973445fc918481556856a509f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of game hacks and free spins. The primary malicious link is http://netcdn.tw/app/406889139/real-coin-master-free-spins-game-hack, which is associated with redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a common pattern of luring users to malicious sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/406889139/real-coin-master-free-spins-game-hack In PDF document text
    • http://gornjastubica.hr/files/free-roblox-builders-club-card_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/roblox-script-executor-free_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/roblox-booga-booga-cheat-engine-how-to-get-unlimited-essence_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/how-to-hack-roblox-games-on-ios_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/roblox-play-now-for-free-unblocked_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-minecraft-java-edition-account_GM479516143.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/coin-master-hack-no-survey-or-verification_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/hacks-admin-roblox_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/como-ser-pro-20-en-roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/how-to-play-minecraft-with-friends-for-free_GM479516143.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/how-to-get-free-robux-without-offers_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
stream_002_off00002ff0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FF0 22920 bytes
SHA-256: e79b0e9d213d22434dbcc962ad28c891aad02222856a04e9500083ebdda89559
font_01_sfnt_off00006355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6355 18248 bytes
SHA-256: ddd8e791914f95ee13f9dec6f95a8982112c815e258aad2e69701e338f1614a0

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