Malicious PDF — malware analysis report

Static analysis result for SHA-256 09fb2196493f62bc…

MALICIOUS

PDF

34.3 KB Created: 2021-07-05 16:06:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b1e6e4876630a7eb386a1c3ef249aa3d SHA-1: d7e3d392c9eca25bb449609ce832263ce1a27a33 SHA-256: 09fb2196493f62bc5de72ab3c70c2f42686d57024ac84e1b22555d0511c76609
160 Risk Score

Malware Insights

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

This PDF document employs a lure of game hacks and generators to trick users into clicking malicious links. The primary link directs to a known malicious redirector infrastructure, which in turn serves further malicious PDF files. The ML classifier strongly indicates malicious intent, and the presence of multiple redirector links reinforces this assessment.

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/inappropriate-roblox-games-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-daily-rewards_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/hack-coin-master-android_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/regal-world-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-retail-tycoon-cheats-xbox-one_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-trolling_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/https-roblox-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spin-facebook-link_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-account-roblox-passebin_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-ios-12_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/pubg-uc-hack-xda_GM1330123889.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-com-passwords-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-2021-no-inspect_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/get-free-robux-now_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_off00002fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FDC 22032 bytes
SHA-256: ed0fc2fd52bfb472926c4b1e6065dfd1e9ed1a42d86d8ff206b30a2271116dbe
font_01_sfnt_off000060a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60A1 19144 bytes
SHA-256: 79a6a5a9ae6257ea638799cb32a861e3301f0777c40791eec12f5a449b6bff8a

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