Malicious PDF — malware analysis report

Static analysis result for SHA-256 94d7ef95866ed152…

MALICIOUS

PDF

33.5 KB Created: 2021-06-20 12:47:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7dfa683c015c0adffd3255ceef52732c SHA-1: e57336cacb155a047bd9b345cfe64902892ac41a SHA-256: 94d7ef95866ed152bce38efda8b5af1240602e2c41c8ea0a3007a1895b274314
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game currency ('Robux') and hacks to entice users. It contains numerous links to external PDFs and a primary redirector URL, indicating a link farm designed to drive traffic to potentially malicious sites. The ML classifier strongly flagged this sample, and the heuristics indicate a malicious redirector and SEO link farm pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/earth-free-robux-game-hack In PDF document text
    • https://sanjoseelectricians.net/images/developer-tools-hack-roblox_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/lila-plays-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/roblox-hack-accounts-online_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/how-to-get-free-roblox-real_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/how-to-get-free-forgotten-knife-in-assasin-y-roblox_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/this-skin-cobonation-gives-you-free-robux_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/roblox-hack-cheat-engine-65-robux_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/roblox-cheat-engine-noclip_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/roblox-hack-free-admin_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/how-to-create-clothes-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/huge-roblox-hacker-hacking-into-acc_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/5-games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/roblox-zombie-rush-free-online_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/roblox-free-robux-site_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/free-robux-without-human-verification-and-no-download_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/roblox-apocalypse-rising-spawn-hack-2021_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/i-got-free-robux-doing-this_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/free-roblox-codes-that-work_GM431946152.pdfIn PDF document text
    • https://sanjoseelectricians.net/images/how-to-animation-hack-on-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_off00002ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EF0 21636 bytes
SHA-256: 40b899d927a31fe7dfa6ecb89d153249c5a3bfd8943067b5fb8124531cd47f2a
font_01_sfnt_off00005e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E30 18988 bytes
SHA-256: aa8c00812ee233177dc7563a4df425c55a8452ae07f251b145da5c8b13a356a3

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