Malicious PDF — malware analysis report

Static analysis result for SHA-256 437de31ef96c9681…

MALICIOUS

PDF

36.6 KB Created: 2021-07-04 12:00:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d2ce567b4dd81d8aeb72696a0668458c SHA-1: 63696fa50611229bdbb4356e1a1c6a01df726231 SHA-256: 437de31ef96c968134bae9a11dcd3ecdbdf9983b817625c684d486eaffc9b243
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'account hacking' lures. The primary redirect URL is http://netcdn.tw/app/431946152/how-to-hack-peoples-roblox-accounts-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack aimed at tricking users into visiting malicious sites, likely for further malware delivery or credential harvesting.

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/how-to-hack-peoples-roblox-accounts-game-hack In PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/roblox-free-exploits_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/lyce-de-roblox-2-hack_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/hack-coin-master-2021-pc_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-hack-easy-2021_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/how-to-hack-coin-master-root_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/ban-and-kick-gui-hack-pastebin-roblox_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-mod-apk-unlimited-spin-download-free-full-version_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-ful-colour-brown-pant-roblox_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/how-to-get-free-food-for-foxy-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/how-to-get-free-bundles-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/synapse-x-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-free-spin-redeem-code_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/how-to-get-minecraft-for-free-2021_GM479516143.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/roblox-sued_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/robux-hack_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/minecraft-free-ios_GM479516143.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/daily-coin-master-free-spin-link_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_off000035c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35C7 22920 bytes
SHA-256: c4b0ab83286afbd83245d11730381647898fd641dffd4b62b2c749c47aac9546
font_01_sfnt_off00006901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6901 19392 bytes
SHA-256: 455054d53819942057d20be51cc97c11c8340df0e33a1662ffdae35838096838

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