Malicious PDF — malware analysis report

Static analysis result for SHA-256 6285bf43fdfa35fe…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 19:10:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a0696489aed8f258598dae30059f3fb7 SHA-1: e83002a9e9ab5eafab2030a8a8a526a18beda2e6 SHA-256: 6285bf43fdfa35fedb02d142e1a22f04a81d9dfabd8ca6882d436d9c167bf27f
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites that claim to offer free in-game currency or hacks, such as 'how-to-get-free-robux-without-downloading-apps-game-hack'. These links are hosted on known malicious redirector infrastructure and are designed to trick users into visiting scam pages. The document body and heuristics strongly indicate a social engineering lure to drive traffic to these malicious sites, likely for credential harvesting or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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.
  • 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/431946152/how-to-get-free-robux-without-downloading-apps-game-hack In PDF document text
    • https://www.sun-a.com/ckfinder/userfiles/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.sun-a.com/ckfinder/userfiles/files/best-tricks-co-robux_GM431946152.pdfIn PDF document text
    • https://www.sun-a.com/ckfinder/userfiles/files/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • https://www.sun-a.com/ckfinder/userfiles/files/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://www.sun-a.com/ckfinder/userfiles/files/free-robux-app_GM431946152.pdfIn PDF document text
    • https://www.sun-a.com/ckfinder/userfiles/files/free-spins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • https://www.sun-a.com/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • https://www.sun-a.com/ckfinder/userfiles/files/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://www.sun-a.com/ckfinder/userfiles/files/oprewards-com-robux_GM431946152.pdfIn PDF document text
    • https://www.sun-a.com/ckfinder/userfiles/files/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • https://www.sun-a.com/ckfinder/userfiles/files/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.sun-a.com/ckfinder/userfiles/files/coin-master-free-rewards-link_GM406889139.pdfIn PDF document text
    • https://www.sun-a.com/ckfinder/userfiles/files/coin-master-fan-page_GM406889139.pdfIn PDF document text
    • https://www.sun-a.com/ckfinder/userfiles/files/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • https://www.sun-a.com/ckfinder/userfiles/files/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • https://www.sun-a.com/ckfinder/userfiles/files/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.sun-a.com/ckfinder/userfiles/files/how-to-hack-coin-master-android_GM406889139.pdfIn PDF document text
    • https://www.sun-a.com/ckfinder/userfiles/files/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.sun-a.com/ckfinder/userfiles/files/toolbox-for-minecraft-pe-ios_GM479516143.pdfIn PDF document text
    • https://www.sun-a.com/ckfinder/userfiles/files/roblox-tracker_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_off000030b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30B6 21396 bytes
SHA-256: 3e1e411441ad6741a96ef6e88ecbf1c28993546070f6a195d5d3ec633ba2708a
font_01_sfnt_off00005f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9B 20060 bytes
SHA-256: 44f0105255c4bb73f6c79bc6e5489dacf7eb081798d72a7dddb9830b56c75d42

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