Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e38a6c569345f63…

MALICIOUS

PDF

35.4 KB Created: 2021-07-05 15:37:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 8344a0a4389a67111634b1504db3b16f SHA-1: 34bda1b4bd412bdc8a0579e412473e2130d5cdaf SHA-256: 2e38a6c569345f63b4ee86fe3bec4a8f14de13cc2632b91d5f8fe8bbbe1b04c9
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 a 'free Robux generator' scam. The ML classifier strongly flagged this PDF as malicious. The embedded URLs and the document body content indicate a lure for users interested in obtaining in-game currency, which is a common social engineering tactic.

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-get-free-robux-website-game-hack In PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-legit-works_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/como-tener-1-millon-de-robux-el-hacker-2021-pro_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-promo-codes-gen-2_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/you-to-get-free-robux-no-hack_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/como-ser-hacker-en-roblox-en-celular_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/roblox-robux-hack-code_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/robuxian-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-diamonds-coin-master_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/account-free-roblox_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/how-to-hack-roblox-accaunt_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/pubg-uc-20_GM1330123889.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/is-there-an-actual-hack-that-work-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-generator-for-roblox-2021_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_off0000315f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x315F 22912 bytes
SHA-256: 8f9a3256788475240545f09e91b0464d4e472ce7ae7970a58e27e62faca13b7f
font_01_sfnt_off000064b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64B3 19304 bytes
SHA-256: c93debd830b422eae21ec10a608c2d09d6fed7207bb4c45cee900aa0b721bbbd

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