Malicious PDF — malware analysis report

Static analysis result for SHA-256 67bb837d7c69def6…

MALICIOUS

PDF

35.1 KB Created: 2021-07-09 17:55:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 583baabb828f4077bf18b53eacc264b6 SHA-1: 82945a5cd37a86304874850a6a89eb546c7fddf4 SHA-256: 67bb837d7c69def6bf4c1c7b3c9f2f79ca0658c445368515ae4416e4afce9fe5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs, including one identified as a malicious redirector infrastructure. The document body and heuristics indicate a lure for 'free Robux' or game hacks, designed to trick users into clicking the malicious link. The primary malicious URL identified is http://netcdn.tw/app/431946152/free-robux-on-iphone-game-hack, which is likely used to deliver a secondary payload or lead the user to a phishing site.

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/431946152/free-robux-on-iphone-game-hack In PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/roblox-bloxburg-build-hacks_GM431946152.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/fake-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/get-free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/avatar-the-last-airbender-roblox_GM431946152.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/do-you-get-windows-10-minecraft-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/easy-robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/free-card-link-coin-master_GM406889139.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/free-robux-real-working_GM431946152.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021-iphone_GM406889139.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/roblox-hackers-list_GM431946152.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/roblox-lua-script-hack_GM431946152.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/free-robux-group_GM431946152.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/supremacy-free-robux_GM431946152.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/how-do-i-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/roblox-avatar-maker-free_GM431946152.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/coin-master-hack-online-download_GM406889139.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/free-roblox-gift-card-codes-2021-unused_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_off00003285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3285 22304 bytes
SHA-256: 10484f3ad5dfe72b2e56a4adf63339b62f77a7b49032d669c786a4baa4089456
font_01_sfnt_off0000643a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x643A 19060 bytes
SHA-256: d8417ca89321b4dfc415403c7a814e3f2ba31710bdc313f579f3c567c18c0aac

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