Malicious PDF — malware analysis report

Static analysis result for SHA-256 364e7753094ea3b1…

MALICIOUS

PDF

44.5 KB Created: 2021-06-08 16:18:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1770c34a74f2488fcfa246c50cd7ed7c SHA-1: 0dbac3188f3437f7ba3ad81770f822c3b090bfd8 SHA-256: 364e7753094ea3b18f230e03bf0e68b72f8b9cc26fc680b95aa3b8e24bf4b4ed
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and a large link farm, all disguised as game hacks or cheats. The primary lure appears to be for 'Dungeon Quest Cheat Engine Roblox', directing users to a suspicious URL. The document's structure and embedded links strongly suggest a phishing or scam campaign designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.tw/app/431946152/dungeon-quest-cheat-engine-roblox-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-online-link_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-daily-spins_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-minecraft-for-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-xbox-360-free-download-code_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-version-2021-download_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spins-cheat-codes_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-tiktok-like_GM835599320.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/oginject-co_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-coin-master-spin-app_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/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-without-verification_GM431946152.pdfIn 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/how-to-get-free-roblox-hair_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_off00004efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EFB 25712 bytes
SHA-256: 93f77235cef5e0081cdcd1bf99a59452c6b9b5f7d207a272a83df58094d7a91e
font_01_sfnt_off0000889c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x889C 19156 bytes
SHA-256: 3f954eb757fced9c0a8a1210d098bc92fc0251b95e99efff725d47936b769142

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