Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3e67e6b69d857b…

MALICIOUS

PDF

34.9 KB Created: 2021-07-04 10:29:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d8b4f1823f061bebf55f5ee18ea6765c SHA-1: d06f9a78dcddaf2847b54467c68fedf8ca112274 SHA-256: bc3e67e6b69d857be4c35a4387f9504cbd84dd17e8fd1f174ccd52c4c295a0b3
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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-hack-ios-10-game-hack PDF link annotation
    • http://camphat.com.vn/upload/UploadFiles/files/free-spins-coin-master-links-blogger_GM406889139.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/roblox-pokemon-brick-bronze-hack-legendary_GM431946152.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/free-roblox-group-giving-robux_GM431946152.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/free-roblox-cards-not-used-2021_GM431946152.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/free-roblox-accessories_GM431946152.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/how-to-get-free-robux-in-a-easy-way_GM431946152.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/fray-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/mcmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/coin-master-game-legitimate-hack-without-signing-up-or-shareing_GM406889139.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/how-to-get-minecraft-bedrock-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/robux-scam_GM431946152.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/coin-master-hack-spins-ios_GM406889139.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/how-to-get-robux-free-easy_GM431946152.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/hacker-t-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/moon-active-games_GM406889139.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • http://camphat.com.vn/upload/UploadFiles/files/parkour-hack-roblox_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_off00003278.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3278 22920 bytes
SHA-256: 1fc1f92d8e7b92e556ffc7e5e3b82d197f3b43be1930b43ac20dc61bcb985b50
font_01_sfnt_off000065c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65C9 18280 bytes
SHA-256: 3e79d4936d888b4ad4fc5a43c908061d2107cf37f241411488affe22978c914d

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