Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4f90af3e806cb1…

MALICIOUS

PDF

33.7 KB Created: 2021-07-04 09:32:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f6a3be558567899e2f7f4b5b483b0ecc SHA-1: 3b38ee332853b1074b69f7a50c593da9a78956a0 SHA-256: dd4f90af3e806cb1e0efc1594b1896f4f05901ea4fab1e2b2f4c587b0f522668
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to redirector infrastructure and potentially malicious sites, masquerading as generators for free game currency or hacks. The heuristic firings indicate the document is designed to lure users to these malicious URLs, which is a common tactic for distributing malware or conducting phishing. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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/406889139/free-coins-coin-master-link-game-hack In PDF document text
    • http://proyetec.com.co/aym_image/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/what-is-robux_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/cheat-code-farming-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/does-roblox-detect-hacks_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/roblox-one-piece-millennium-cheat_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/facebook-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/pokemon-go-free-latest-version_GM1094591345.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/free-robux-no-survey-no-password-no-download_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/roblox-redeem-codes-free_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/robux-free-co_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/how-to-get-free-robux-no-verification-youtube_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/microsoft-roblox_GM431946152.pdfIn PDF document text
    • http://proyetec.com.co/aym_image/files/coin-master-free-spins-twitter_GM406889139.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
stream_002_off00002f20.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F20 22624 bytes
SHA-256: 5741b46c5c5b83aa82f4c07d499c507d563bdb493cde08b948370c5ca9c045ef
font_01_sfnt_off00006173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6173 18168 bytes
SHA-256: b0fd03f2280421e1c8ba538a35ec3a9afcfe64ddb22ef6ef66156561f264a38b

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