Malicious PDF — malware analysis report

Static analysis result for SHA-256 775128fd744bd965…

MALICIOUS

PDF

41.2 KB Created: 2021-05-11 00:41:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0450ca5f625969eae076e1de7db1f651 SHA-1: 2c11b2246212bc9cad00c53caae5306f3acbba54 SHA-256: 775128fd744bd9652b6ef11ded4e981b1789bf6dab67464fd30506333f39b9c9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector for a "game hack" lure. The primary link directs to `https://netcdn.xyz/app/406889139/coin-master-free-spins-link-2021-ios-game-hack`, which is associated with known malicious infrastructure. The document body and embedded links suggest a social engineering attempt to trick users into visiting potentially harmful websites.

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/coin-master-free-spins-link-2021-ios-game-hack In PDF document text
    • https://dentmate.com.tw/image/data/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/roblox-place-rewards_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-free-400-spin-link_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/roblox-hack-client_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-spin-coin_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-spins-for-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/roblox-data-breach_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/wurst-client-18-9_GM479516143.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-game-free-spin_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-free-spins-for-iphone_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/roblox-hack-me_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-rewards-free-spins_GM406889139.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
stream_003_off0000481a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x481A 23780 bytes
SHA-256: 21e471d31729625a31119a2682f08ec7bc3de24dae2dd0de8cd245e4ca7c72b9
font_01_sfnt_off00007def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEF 18456 bytes
SHA-256: 405c435adaafa0da304b7a4986d8f56c56dc87ed278d5cff2ac0c57977d8d7e3

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