Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a86f61f23020f88…

MALICIOUS

PDF

41.1 KB Created: 2021-05-19 00:31:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 38a144ec712093f0382ef3e38e616841 SHA-1: cda3ee8ebfdd73e877f295e722f8ca4a11b4c4a6 SHA-256: 3a86f61f23020f88662152a211923eee0e2d9571b7c5628c89b57d3f532d97e1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as game hacks and generators. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs likely lead to further malicious content or phishing pages designed to trick users into downloading malware or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/game-coin-master-hack-game-hack In PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-robux-android_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/minecraft-aimbot_GM479516143.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-coin-master-gift-link_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/getrobux-info_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-hack-download-ios_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/minecraft-xbox-360-free_GM479516143.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-to-make-a-minecraft-client_GM479516143.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-coins-for-flip-master_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/robux-free-online_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-400-spins-coins-master_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000476e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x476E 24356 bytes
SHA-256: 15fa18d5c0a2c489601b158e0c4e66e19e8d6899350cdf35c428725cd81b7bf3
font_01_sfnt_off00007f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F2A 17976 bytes
SHA-256: 206c578388b9bac3d1752862f80fd049ac7eba4f7fbaab7734ea75c2cf25eb07

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