Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb51d7c51cbb077…

MALICIOUS

PDF

44.9 KB Created: 2021-05-17 07:13:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ca6a4c0ea940825c1703041fc5d8f73c SHA-1: aa388cd1daf29972edd4dc128047cca5e1845300 SHA-256: 7cb51d7c51cbb077d11c61bcac4a6c06d52bf03bda2389cb9288089325a3f944
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 0.9632

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 https://netcdn.xyz/app/431946152/free-roblox-hair-to-wear-game-hack PDF link annotation
    • https://bwsrubber.com/image/data/files/coin-master-hack-trick-2021_GM406889139.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/best-free-hacked-client_GM479516143.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/coin-master-free-spins-daily-link-game-mod_GM406889139.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/free-roblox-gift-card-codes-2021-unused_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/coin-master-daily-bonus-hack_GM406889139.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/coin-master-free-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/coin-master-daily-free-spins-link-app-download_GM406889139.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/coin-master-hack-generator_GM406889139.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/coin-master-35-2-hack_GM406889139.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/coin-master-hack-apk-iphone_GM406889139.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://bwsrubber.com/image/data/files/minecraft-aimbot_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000048c3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48C3 24980 bytes
SHA-256: 7cf19fde574aaaa606c863a33edafb1fb0949177c08a90aa2f0bca6ed1e96445
font_01_sfnt_off000082c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82C7 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00008c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C78 18496 bytes
SHA-256: adf075a740c6f928a3b94d4aeef99adcd15710aa40e26859f6513b600edf11fb

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