Malicious PDF — malware analysis report

Static analysis result for SHA-256 a626f3bba76d6c55…

MALICIOUS

PDF

34.7 KB Created: 2021-07-08 05:43:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 56eb9d8ae73f88126ccc9faa90b4943b SHA-1: a720cd7a1a3f43c4bff8be455ee6e039e6209d14 SHA-256: a626f3bba76d6c55d826819ef66d5f0de868429513853a8df00341ab3b7e7dd3
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous links designed to lure users into clicking on them by promising free in-game currency or hacks. The primary link redirects to malicious infrastructure, and the document body itself contains many similar links pointing to PDF files hosted on a link farm. The presence of a visual download button further supports the lure-based attack 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.tw/app/431946152/free-robux-clothes-game-hack In PDF document text
    • http://www.area-tlc.com/public/ckfinder/userfiles/files/how-to-get-roblox-for-free-pastebin_GM431946152.pdfIn PDF document text
    • http://www.area-tlc.com/public/ckfinder/userfiles/files/roblox-download-apk-pc-free_GM431946152.pdfIn PDF document text
    • http://www.area-tlc.com/public/ckfinder/userfiles/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.area-tlc.com/public/ckfinder/userfiles/files/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://www.area-tlc.com/public/ckfinder/userfiles/files/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • http://www.area-tlc.com/public/ckfinder/userfiles/files/hacks-para-roblox-aimbot-en-strucid_GM431946152.pdfIn PDF document text
    • http://www.area-tlc.com/public/ckfinder/userfiles/files/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • http://www.area-tlc.com/public/ckfinder/userfiles/files/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.area-tlc.com/public/ckfinder/userfiles/files/roblox-jailbreak-money-hack-2021-trke_GM431946152.pdfIn PDF document text
    • http://www.area-tlc.com/public/ckfinder/userfiles/files/free-private-minecraft-server_GM479516143.pdfIn PDF document text
    • http://www.area-tlc.com/public/ckfinder/userfiles/files/coin-master-free-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.area-tlc.com/public/ckfinder/userfiles/files/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.area-tlc.com/public/ckfinder/userfiles/files/como-hackear-a-jugadores-de-roblox_GM431946152.pdfIn PDF document text
    • http://www.area-tlc.com/public/ckfinder/userfiles/files/free-coins-2021-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.area-tlc.com/public/ckfinder/userfiles/files/wurst-18_GM479516143.pdfIn PDF document text
    • http://www.area-tlc.com/public/ckfinder/userfiles/files/free-robux-generator-computer_GM431946152.pdfIn PDF document text
    • http://www.area-tlc.com/public/ckfinder/userfiles/files/is-roblox-free-on-pc_GM431946152.pdfIn PDF document text
    • http://www.area-tlc.com/public/ckfinder/userfiles/files/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.area-tlc.com/public/ckfinder/userfiles/files/how-to-hack-assassin-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.area-tlc.com/public/ckfinder/userfiles/files/roblox-games-com-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_off00003138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3138 22032 bytes
SHA-256: 3bb2c5662aec4404a413658832f3c567767abb403e6c59e1662ec675c94e0c49
font_01_sfnt_off00006276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6276 19060 bytes
SHA-256: 97364360b0ef57788754a1eb8a616304bf845de832d3f27808b1c0193cfeafc1

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