Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f615afc3ed0643…

MALICIOUS

PDF

35.6 KB Created: 2021-07-07 00:38:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9873e0b5ef37643c2877e771b92814ee SHA-1: 941c11bfc865ef8e94378640327fd4d26e849b5b SHA-256: 54f615afc3ed0643c69fd05bc4cbd8cb340cc1042da327cd2f86d510d3fe35a0
142 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are presented as 'game hacks' or 'free spins' for popular games like Coin Master and Robux. This pattern suggests a lure to drive traffic to potentially malicious sites, possibly for phishing or to host further malware. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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 http://netcdn.tw/app/406889139/coin-master-free-spins-without-verification-game-hack PDF link annotation
    • https://www.jonaled.com/uploaded_files/userfiles/files/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • https://www.jonaled.com/uploaded_files/userfiles/files/how-to-hack-any-server-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.jonaled.com/uploaded_files/userfiles/files/coin-master-hack-spin-ios_GM406889139.pdfIn PDF document text
    • https://www.jonaled.com/uploaded_files/userfiles/files/como-hackear-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jonaled.com/uploaded_files/userfiles/files/free-robux-quiz_GM431946152.pdfIn PDF document text
    • https://www.jonaled.com/uploaded_files/userfiles/files/free-robux-andoid-robux-hac_GM431946152.pdfIn PDF document text
    • https://www.jonaled.com/uploaded_files/userfiles/files/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://www.jonaled.com/uploaded_files/userfiles/files/no-human-verification-free-tiktok-fans_GM835599320.pdfIn PDF document text
    • https://www.jonaled.com/uploaded_files/userfiles/files/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jonaled.com/uploaded_files/userfiles/files/best-free-game-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.jonaled.com/uploaded_files/userfiles/files/coin-master-free-spins-save_GM406889139.pdfIn PDF document text
    • https://www.jonaled.com/uploaded_files/userfiles/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://www.jonaled.com/uploaded_files/userfiles/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://www.jonaled.com/uploaded_files/userfiles/files/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://www.jonaled.com/uploaded_files/userfiles/files/roblox-character-customizer-free_GM431946152.pdfIn PDF document text
    • https://www.jonaled.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://www.jonaled.com/uploaded_files/userfiles/files/roblox-password-hacker-download_GM431946152.pdfIn PDF document text
    • https://www.jonaled.com/uploaded_files/userfiles/files/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • https://www.jonaled.com/uploaded_files/userfiles/files/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • https://www.jonaled.com/uploaded_files/userfiles/files/how-to-hack-roblox-health_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
stream_002_off00003324.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3324 23104 bytes
SHA-256: fc372f73e9c0c71558ab5c56fdce3c170b5cbcdf30f98aaf2b422c70654c0734
font_01_sfnt_off0000670e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x670E 18812 bytes
SHA-256: efebb9ab85318ef2fcc466b1ba77fdbcbd0ba4e561c4fe4ef6f775257a73b700

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