Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa0ba04c326c2418…

MALICIOUS

PDF

47.2 KB Created: 2021-06-03 06:19:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 69ab9719af28cc65bac4b0ba8398aabf SHA-1: d11c14467f3b18b1e9bf2c5615564110b512f3e4 SHA-256: fa0ba04c326c2418ff86f2482b840f834a9ccebb7138baaaa8a6c8b7c8d073fc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'game hacks' and 'free generators'. The primary lure URL is https://netcdn.online/app/406889139/coin-master-free-gold-cards-link-game-hack, which is also present in the document body. The ML classifier strongly indicated maliciousness, and the presence of redirector links points to a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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 https://netcdn.online/app/406889139/coin-master-free-gold-cards-link-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spin-coin-master-hacktoman_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/what-do-points-do-in-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-daily-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/spins-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-switch-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-promo-code-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/pubg-uc-kuwait_GM1330123889.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/play-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/pasos-para-hackear-coins-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-pocket-edition-hack_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-domain-for-minecraft-server_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051b1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51B1 25456 bytes
SHA-256: 5310186e058c9a1e4fea8eeeae037fd8cef45029323b618cad7b0e8d5bebcf79
font_01_sfnt_off00008c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C6A 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9655 18128 bytes
SHA-256: 70aaa51de045f356af96609cbefa464fa4c02188ab9d169d531121296ec6db77

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