Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2b8136898a7aba…

MALICIOUS

PDF

45.5 KB Created: 2021-05-19 05:39:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 00420ed2b16251531499d79759dc5eae SHA-1: 1baed99ccce155b55ab580b24c3ce7062cdedea0 SHA-256: cf2b8136898a7aba18b54be1f151751cba5dbddcbbc9ce1369e17d4a0dc60f78
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 https://netcdn.xyz/app/431946152/how-to-hack-in-arsenal-game-hack PDF link annotation
    • https://www.cj-aircons.co.za/images/how-to-get-daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cj-aircons.co.za/images/how-to-gift-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://www.cj-aircons.co.za/images/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • https://www.cj-aircons.co.za/images/all-coin-master-spin-link-and-free-download_GM406889139.pdfIn PDF document text
    • https://www.cj-aircons.co.za/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.cj-aircons.co.za/images/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cj-aircons.co.za/images/coin-master-firebird-card-free_GM406889139.pdfIn PDF document text
    • https://www.cj-aircons.co.za/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.cj-aircons.co.za/images/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • https://www.cj-aircons.co.za/images/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://www.cj-aircons.co.za/images/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • https://www.cj-aircons.co.za/images/coin-master-daily-free-coins-link-today_GM406889139.pdfIn PDF document text
    • https://www.cj-aircons.co.za/images/rbx-earn_GM431946152.pdfIn PDF document text
    • https://www.cj-aircons.co.za/images/what-do-roblox-points-do_GM431946152.pdfIn PDF document text
    • https://www.cj-aircons.co.za/images/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://www.cj-aircons.co.za/images/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://www.cj-aircons.co.za/images/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://www.cj-aircons.co.za/images/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
    • https://www.cj-aircons.co.za/images/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://www.cj-aircons.co.za/images/john-doe-roblox-hacker_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_003_off00004bbd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BBD 31088 bytes
SHA-256: 93114ebbb7555dd0112578bbccc0edb520273b69c988d5861b700922d2889195
font_01_sfnt_off000090a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90A8 17976 bytes
SHA-256: 2ee2d72c9f8106232dd4d475232b278a4f40f0923d5703e5df1f07c18625cce1

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