Malicious PDF — malware analysis report

Static analysis result for SHA-256 6496315af05248c9…

MALICIOUS

PDF

34.7 KB Created: 2021-07-08 11:35:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c23b32dab132c55bcec7e0365ab5359c SHA-1: b13b897eec42e81a6aab304037ea23c2963b0302 SHA-256: 6496315af05248c912a437207e11f629a9fe8dbe8b2d73f61f2b3e5cee3f3e9c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to a known malicious redirector infrastructure, specifically advertising 'free Robux' or game hacks. The document body and heuristics confirm the lure is for free game items, and the ML classifier strongly indicates maliciousness. The primary IOC is the redirector URL, which is likely used 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/microsoft-free-robux-game-hack In PDF document text
    • https://www.efeskbb.com/upload/content/files/free-minecraft-java-edition_GM479516143.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/hack-electric-state-darkrp-beta-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/roblox-girl-clothes-free_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/roblox-ftw_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/free-admin-roblox-pastebin_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/best-way-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/comment-cheater-sur-roblox-franais_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/how-to-draw-on-roblox-free-draw_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/appsmobinfo-coinmasterhack-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/comment-crer-son-propre-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/como-hackear-comandos-de-roblox_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/sondage-for-free-robux_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/does-roblox-ever-give-out-free-robux_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/dominus-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/robux-hack-download-2021_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/dungeon-quest-roblox-hack-free_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_off000030ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30AE 22388 bytes
SHA-256: c97338d9a6a015be9c8b151e8b70771f0e3bb1dcd7246789814f1769169a5aea
font_01_sfnt_off00006240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6240 19136 bytes
SHA-256: eceba35cd6627b8fd8c95b6fc578f752ad37bdbc88f79a1a211c8d87d48b0e2f

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