Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9af1cc4b2825d0c…

MALICIOUS

PDF

34.9 KB Created: 2021-07-08 21:49:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d2b3f189c48bfe53522e2d757470c005 SHA-1: 2e08a94e5434e3852accc725ad9eb8458b0a3b44 SHA-256: b9af1cc4b2825d0c50b0560093a2e82fab981860606a3a8ff4c48fb0d63ff584
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-apk-july-29-game-hack PDF link annotation
    • http://www.ventureit.com.sg/uploaded_files/userfiles/files/roblox-hack-no-human-verification-on-pc_GM431946152.pdfIn PDF document text
    • http://www.ventureit.com.sg/uploaded_files/userfiles/files/roblox-super-power-training-simulator-free-vip-server-no-pvp_GM431946152.pdfIn PDF document text
    • http://www.ventureit.com.sg/uploaded_files/userfiles/files/coin-master-spins-for-free_GM406889139.pdfIn PDF document text
    • http://www.ventureit.com.sg/uploaded_files/userfiles/files/robux-hack-2021-admin-codes_GM431946152.pdfIn PDF document text
    • http://www.ventureit.com.sg/uploaded_files/userfiles/files/how-to-get-fre-robux-inspect-element-not-fake_GM431946152.pdfIn PDF document text
    • http://www.ventureit.com.sg/uploaded_files/userfiles/files/roblox-hack-2021-download-free_GM431946152.pdfIn PDF document text
    • http://www.ventureit.com.sg/uploaded_files/userfiles/files/roblox-hack-age-checker-how-to-find-other-peoples-ages_GM431946152.pdfIn PDF document text
    • http://www.ventureit.com.sg/uploaded_files/userfiles/files/free-robux-no-human-verification-and-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://www.ventureit.com.sg/uploaded_files/userfiles/files/alfheim-online-free-accessories-roblox_GM431946152.pdfIn PDF document text
    • http://www.ventureit.com.sg/uploaded_files/userfiles/files/coin-master-game-legitimate-hack-without-signing-up-or-shareing_GM406889139.pdfIn PDF document text
    • http://www.ventureit.com.sg/uploaded_files/userfiles/files/free-aand-true-ways-to-get-robux-windows-10_GM431946152.pdfIn PDF document text
    • http://www.ventureit.com.sg/uploaded_files/userfiles/files/free-working-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://www.ventureit.com.sg/uploaded_files/userfiles/files/earn-robux-for-freecom_GM431946152.pdfIn PDF document text
    • http://www.ventureit.com.sg/uploaded_files/userfiles/files/red-boy-cheat-roblox-download_GM431946152.pdfIn PDF document text
    • http://www.ventureit.com.sg/uploaded_files/userfiles/files/ar-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://www.ventureit.com.sg/uploaded_files/userfiles/files/how-to-get-10-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.ventureit.com.sg/uploaded_files/userfiles/files/roblox-hacks-tower-of-hell_GM431946152.pdfIn PDF document text
    • http://www.ventureit.com.sg/uploaded_files/userfiles/files/roblox-spam-hack_GM431946152.pdfIn PDF document text
    • http://www.ventureit.com.sg/uploaded_files/userfiles/files/robux-free-infini_GM431946152.pdfIn PDF document text
    • http://www.ventureit.com.sg/uploaded_files/userfiles/files/how-to-get-into-a-hacked-roblox-account_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
font_00_sfnt_off00003129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3129 22476 bytes
SHA-256: 1b0bc66488432de50c8231cbe3023579be5cb1182687991df55f7f5316056ef7
font_01_sfnt_off0000633c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x633C 19028 bytes
SHA-256: 3ad37a86976cb2f68fb9487c91401566e7b5c76794aeed29845587ca95c5dc1f