Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d23853bb213bd1b…

MALICIOUS

PDF

35.2 KB Created: 2021-06-20 06:01:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1abbd7d2a2eceec5d95b57394497ee5f SHA-1: bb645a7cc4e8eac1740a3bd6e240c96040e953d3 SHA-256: 2d23853bb213bd1b81bbcb17bf8308ed7d6b2cd298047cf0a2160a762dfb8bdd
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game hacks and in-game currency to trick users into clicking malicious links. The embedded URLs point to redirectors and SEO link farms, which are often used to distribute malware or phish for credentials. The ML classifier strongly indicated maliciousness, and the heuristics confirm the use of redirector infrastructure and a link farm.

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/i-love-cats-shirt-roblox-free-game-hack In PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/100-free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/minecraft-noob-vs-pro-vs-hacker_GM479516143.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/roblox-tix-factory-for-free_GM431946152.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/tiktok-free-followers-apk_GM835599320.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/hacks-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/hack-robux_GM431946152.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/coin-master-daily-bonus-hack_GM406889139.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/coinmaster-spin-ml-free_GM406889139.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/get-free-robux-today_GM431946152.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/coin-master-spin-link-hack_GM406889139.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/how-to-get-robux-in-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/coin-master-hack-app-for-iphone_GM406889139.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • https://www.gulfautotools.com/uploaded_files/userfiles/files/can-you-give-me-free-robux_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_off00003464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3464 21808 bytes
SHA-256: d81b2a8d8ccac0b75c5ce45ff4c3fa6e4a826aa4d186db1263f25da5d70a4e5c
font_01_sfnt_off00006465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6465 19156 bytes
SHA-256: d913504794bed89df225808faaaeb646bd9bb1e87e163c41ecb49f53a03f4e27

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