Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7420a37eb782ae7…

MALICIOUS

PDF

34.0 KB Created: 2021-06-18 15:57:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 16ac92cb0e6d00c917e39b509269bfe5 SHA-1: 54224cbd01e81cc1edaaf898d956fd4bbcde75be SHA-256: a7420a37eb782ae70421b215201b7e8942917b2f4a87cddeaa6ca6236b37df6d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as generators for game hacks and cheats. The primary redirector, http://netcdn.co/app/431946152/how-to-hack-in-ice-mountain-roblox-game-hack, is flagged as malicious. The document body and embedded URLs suggest a lure for users seeking in-game advantages, likely leading to malware downloads or phishing pages.

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.co/app/431946152/how-to-hack-in-ice-mountain-roblox-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/gamesofficenet-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-tool-without-human-verification_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-how-to-hack-in-your-game-hack-gui_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-unlimited-spins-and-coins-cheats_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-fb-free-spins-link_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/toolbox-apk_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/pubg-uc-new-redeem-code_GM1330123889.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/freecoins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/microsoft-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-tiktok-fans-and-likes_GM835599320.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-and-spin_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/reddit-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/is-pokemon-go-free-to-download_GM1094591345.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-2021-no-human-verification_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_off00002f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F42 21932 bytes
SHA-256: 535ae26ef853a379bc526ad4e34e514fd87105f70441f1394f2ea10e0eaf221c
font_01_sfnt_off00005f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F6F 19196 bytes
SHA-256: e642e404ccf7702b6cf532e1d39e3ef9f764dfdcde0d7b079c1c58ea041f7c37

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