Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c760a0f267b09d8…

MALICIOUS

PDF

35.5 KB Created: 2021-07-03 13:21:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d29c4cc248dd112c72891d56a31a25f3 SHA-1: b15ccc42901f5b39cea998f4a36d390e9960e398 SHA-256: 9c760a0f267b09d80baeb0b91191b7314a842d104eab22c876d5357df3229dc7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and infrastructure, disguised as lures for game hacks and free items. The primary link, http://netcdn.tw/app/406889139/free-coin-master-spins-link-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a site that likely hosts further malicious content or exploits. The ML classifier also strongly indicated maliciousness.

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/free-coin-master-spins-link-game-hack In PDF document text
    • https://adventureglaciertreks.com/userfiles/files/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/free-tiktok-likes-trial_GM835599320.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/free-spins-coin-master-november-2021_GM406889139.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/get-free-robux-info_GM431946152.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/coin-master-codes_GM406889139.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/cheat-engine-in-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/roblox-free-online-login_GM431946152.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/robuxian-com-free-robux-code_GM431946152.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/free-spins-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/john-doe-roblox-hacker_GM431946152.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/coin-master-mod_GM406889139.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/free-spins-coin-master-links-no-human-verification_GM406889139.pdfIn PDF document text
    • https://adventureglaciertreks.com/userfiles/files/coin-master-free-cards-link-2021_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
font_00_sfnt_off0000358b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x358B 22524 bytes
SHA-256: 0f0f1a9d90e0d827e168a9098628e5191deeb78f5961b1af5d34185ed9892ab4
font_01_sfnt_off000067cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67CC 18344 bytes
SHA-256: e5708adc55f341f1815264f824e66db99aea16b99fe97f5a0313ff5db2d8cb38

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