Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4630b3685d4d14…

MALICIOUS

PDF

34.0 KB Created: 2021-07-05 07:20:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: adae17c120ddea49f6542efed93f7ee7 SHA-1: cf03e4f036df78881689e342e154be9b5ff56c3f SHA-256: 6b4630b3685d4d143303585eb24160e6b21f043a3b6a09eaa67c1fd793059ccb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirectors and potentially malicious content, disguised as generators for popular games like Roblox and Coin Master. The heuristic firings indicate these links lead to known malicious infrastructure and are designed as lures. No scripts were extracted, but the document body and heuristics strongly suggest a phishing or malware distribution attempt.

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/get-free-robux-no-verification-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/hack-roblox-players_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-bloxburg-for-free-without-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-highschool-free-money_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/can-u-u-use-cheat-engine-on-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-minecraft-wallpaper_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-coins-for-flip-master-online_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/pokemon-go-free-raid-passes-2021_GM1094591345.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/claim-free-robux_GM431946152.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/how-to-hack-roblox-with-inspect-element-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/fly-hack-in-eny-roblox-game-phone_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-speed-hack-in-roblox_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_off00002fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FBB 21820 bytes
SHA-256: 902d847d443ae300eae7ebf2cbc17df928cd1b48a99eee03e53925404e96ff33
font_01_sfnt_off00005faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAF 19072 bytes
SHA-256: e72ada6374821b36eed7d40ca7e66d9301b0fa24814d932b66fe4108e9a41cd9

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