Malicious PDF — malware analysis report

Static analysis result for SHA-256 be03b47aceea36ee…

MALICIOUS

PDF

35.0 KB Created: 2021-07-03 14:54:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 397a11dcdfdc072401e21798edcf18ae SHA-1: 5de23277253547e2b12de4bbe656af0de0217219 SHA-256: be03b47aceea36ee99f44acc0ecd9131020d697a7cfa29bab3e63a88b204c0b3
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/download-coin-master-apk-hack-game-hack PDF link annotation
    • http://www.valenciamaids.com/userfiles/files/free-printable-roblox-images_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/tiktok-free-view-your-liked-videos_GM835599320.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/wurst-commands_GM479516143.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/minecraft-free-download-apk-softonic_GM479516143.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-unlimited-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-hack-without-verify_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/get-robux-today_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/easypoints-gg-roblox_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-free-gold-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/app-store-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/spinuri-gratis-coin-master_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/rbx-earn_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_off00003024.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3024 23196 bytes
SHA-256: 6d96c5cbb8a355d43275c596f898f7122940b5664009000c9bc90b5c4ff21394
font_01_sfnt_off00006493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6493 18760 bytes
SHA-256: 730ee1d96cda19f7c4a03b449f27cedd631d74d7639b5d8272a7d4c4d2e1f6fc