Malicious PDF — malware analysis report

Static analysis result for SHA-256 c621fc2b4ca2f9f1…

MALICIOUS

PDF

44.0 KB Created: 2020-08-14 18:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b43ca2669bf5b5642c36628936064e2a SHA-1: e1e8442758b1eda4b4634f495d624dcb7a302bec SHA-256: c621fc2b4ca2f9f1d06fa84b5e669f504ad3e31b3af33897b3625399607b6c29
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to ttraff.com. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The embedded document body text, though partially corrupted, contains the malicious URL and appears to be a lure related to 'terapia ocupacional geriatria pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ttraff.com/wb?keyword=terapia%20ocupacional%20geriatria%20pdf
    • http://files.lagumbofest.com/uploads/1/3/1/8/131857419/fezidegovoji.pdf
    • http://files.gregharveygallery.com/uploads/1/3/1/3/131384436/8861269.pdf
    • https://cdn.shopify.com/s/files/1/0431/5290/0260/files/dukelugizezibidetumi.pdf
    • https://cdn.shopify.com/s/files/1/0437/1103/7591/files/kx_shadow_thetechgame.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8216/files/intensive_care_society_staffing_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0428/9134/6079/files/certificado_mdico_escolar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9862/0569/files/31926856998.pdf
    • https://cdn.shopify.com/s/files/1/0436/1102/9667/files/53545055999.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5604/files/gevikuzetesid.pdf
    • https://cdn.shopify.com/s/files/1/0438/2906/7938/files/54533312708.pdf
    • https://cdn.shopify.com/s/files/1/0448/3658/5629/files/define_administrative_management.pdf
    • https://cdn.shopify.com/s/files/1/0433/3699/0885/files/legimoboxikogir.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006072.bin
45714c4ca0595aba5f844172ee323daa2fdbb0e96559deddb3be234dc5fffc41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6072 4976 bytes
font_01_sfnt_off00007164.bin
1663eca68765ac7d0bbe1beb8b16eb0b2b9f6900175bc2455cddd79b65cea624		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7164 11044 bytes
font_02_sfnt_off00009546.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9546 4324 bytes

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