Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40261b3ea88614f…

MALICIOUS

PDF

42.0 KB Created: 2021-05-19 17:42:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6f92fb328a5e508d3eb92b4dd2778d9a SHA-1: 9ad48cbbda89a7515a6ed8ac0b628f2f0bf0fc41 SHA-256: f40261b3ea88614f03b582acae5df5fa2c2972f736e0e7ad3cb168ddee5285a9
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to external websites, including one explicitly labeled as a 'free generator / game hack'. The ML classifier strongly flagged this PDF as malicious, and the presence of these lures suggests a social engineering attack. The document likely aims to trick users into visiting these sites, which could lead to malware downloads or further phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/1330123889/pubg-uc-xyz-game-hack PDF link annotation
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/coin-master-free-spins-link-download-today_GM406889139.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/free-apk-mods-coin-master_GM406889139.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/free-spins-generated-from-coin-master_GM406889139.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/how-to-get-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/spin-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/coin-master-hack-apk-download-for-android-mobile_GM406889139.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/coin-master-free-spins-link-deutsch-ios_GM406889139.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • https://www.biofarshrimpskincare.com/ckfinder/userfiles/files/how-to-use-wurst_GM479516143.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_off00004870.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4870 26096 bytes
SHA-256: ba70405635305a609b30dcfc5da9e3c279333da10d8f4ba46b6f798c3fad2591
font_01_sfnt_off00008153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8153 18388 bytes
SHA-256: 423ecd63b958ef947e97c62cafb429c5458f8a0e1c704477fc405d9429ff56f4

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