Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf09fc48d3e29cf…

MALICIOUS

PDF

34.2 KB Created: 2021-07-05 23:15:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d82ee7de720ba96091a0ea59084a9259 SHA-1: 4d10ea1c8c9e2c8532fa7961e5bb939faf068a63 SHA-256: aaf09fc48d3e29cf4b96ca74a82154f922feee28c0478de67426dc4f62f58d39
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains multiple links designed to lure users into clicking on a URL that redirects to malicious infrastructure. The primary lure is related to 'free Robux' or game hacks, a common social engineering tactic. The embedded URLs, such as http://netcdn.tw/app/431946152/free-robux-for-kids-no-verification-game-hack, are flagged as malicious redirectors, indicating a likely attempt to deliver a secondary payload or phish for credentials.

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-for-kids-no-verification-game-hack In PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/how-do-you-get-free-stuff-in-roblox-2021_GM431946152.pdfIn 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/roblox-free-robux-legal_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/hack-roblox-money-2021_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/roblox-slient-aim-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/is-minecraft-free-on-mac_GM479516143.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/roblox-free-candy-script-pastebin_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/how-to-hack-a-server-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/offers-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-using-javascript_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/roblox-phantom-forces-free-robux-bot_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/roblox-hack-github-robux_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-promo-codes-roblox_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_off00002d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D4C 22704 bytes
SHA-256: 450abbbb254825c59ff1565aa745c966b4607a2a605a78713e3cbb14b4f6b57e
font_01_sfnt_off00005fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD6 19248 bytes
SHA-256: cfee841a5dae106b2cf9b4cdd4f4599820923438d7b3e36504f4b087b21eb8e1

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