Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a0eef4166f0c2f7…

MALICIOUS

PDF

37.9 KB Created: 2021-06-30 03:48:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 25a7553a21009e91da4075354fc55d0a SHA-1: cd525bf73dfe596b1fa4b0a36096dcaeee61ae89 SHA-256: 6a0eef4166f0c2f766bcabc8f2327aa11041376ee60718c483c7c47c67c0512f
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links disguised as 'free generators' or 'game hacks' for popular games like Roblox and Coin Master. The primary link, http://netcdn.co/app/431946152/hack-cuentas-gratis-en-roblox-pastebin-game-hack, is identified as a malicious redirector. The document's structure and content strongly suggest a phishing or malware distribution attempt, likely using a link farm to obscure the final malicious destination. No scripts were extracted, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.co/app/431946152/hack-cuentas-gratis-en-roblox-pastebin-game-hack In PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-vermillion_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-secret_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/750-robux-free_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/break-free-by-ariana-grande-roblox-id_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-gun-simulator-money-hack_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-coin-master-spin-generator_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-coins-2021-coin-master-link_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-mod_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/change-your-in-game-name-on-roblox-hack_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-free-codes-on-toys_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-deals_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-hack-on-pc-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-free-items-in-roblox-tagalog-2021-march_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-hack-no-survey-2021_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-spins-23-march-2021_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-2021-august_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/unredeemed-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-hack-into-peoples-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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_off00003c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3C85 22692 bytes
SHA-256: ec2cf5770ec3df94873892617445f66451e6eefbb81f61abd6c8b2bc8ec3f3c3
font_01_sfnt_off00006f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F0B 19176 bytes
SHA-256: 6683f73409874b03cd74cedc19bf502948d07811deb567101a2d38fee6ab6158

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