Malicious PDF — malware analysis report

Static analysis result for SHA-256 af55432608e629dd…

MALICIOUS

PDF

42.8 KB Created: 2021-05-16 02:10:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 92c93fbad35dc27ada747e1b605e79ca SHA-1: 300d146be60ce30f878f4a90479b32591e5d006e SHA-256: af55432608e629dd21f8de982744ed26ea4c1e108448088589d26b51bff2f240
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising "Coin Master Hack" generators. The document body and embedded links suggest a lure to a scam or potentially a downloader for further malicious activity. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

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-hack-coins-game-hack In PDF document text
    • https://edu.kyst.com.tw/image/data/files/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/hack-coin-master-spin-apk_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-free-clothes-girl_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-minecraft-client_GM479516143.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-card-hack-apk_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-coin-master-spin-daily-link_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-script-executor-roblox_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/hack-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-role-in-coin-master_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/clean-master-coins-hack_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-redeem-code-for-coin-master_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-old-avatar_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_off00004cc2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CC2 25596 bytes
SHA-256: a972646341fb37e362db0a5982ffca8bb1ce28a99e7660d50c511087ed297089
font_01_sfnt_off000086cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86CB 17716 bytes
SHA-256: c15a8689411d8cca9ab0759ab4c496fe9b4353d676dd738e300719e9588112ed

Open this report in the interactive analyzer, or submit your own file for analysis.