Malicious PDF — malware analysis report

Static analysis result for SHA-256 391ecfc2f24d8bd9…

MALICIOUS

PDF

64.8 KB Created: 2020-07-28 18:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a72f8f6f47ce3f6fd5cdab0b7330b6ea SHA-1: 4b3e37709f7c09675fb981b1435a2614cc079cc1 SHA-256: 391ecfc2f24d8bd9e67388d4f4e1fe7430980a3bff5d9ae6d9cb739ff3c8887d
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, a technique often used to create link farms for SEO manipulation or to obscure malicious destinations. One of the embedded URLs, 'https://ttraff.cc/pify?keyword=absolutismo+monarquico+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be malformed or encrypted, providing no direct clues about the user-facing lure.

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.cc/pify?keyword=absolutismo+monarquico+pdf
    • http://files.judithgoldstonedesigns.com/uploads/1/3/1/6/131607022/vizivilivofi.pdf
    • http://files.thebeardedcardtrader.com/uploads/1/3/0/7/130740202/6516530.pdf
    • http://files.alltechconsultinggroup.com/uploads/1/3/0/7/130739419/8217023.pdf
    • http://files.bbartbyangelica.com/uploads/1/3/1/4/131437064/06c1b6ae35786.pdf
    • https://cdn.shopify.com/s/files/1/0433/6045/2760/files/mudujovobedebidib.pdf
    • https://cdn.shopify.com/s/files/1/0431/1482/3844/files/tizirejimu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/75314681204.pdf
    • https://cdn.shopify.com/s/files/1/0433/4324/9563/files/84365181830.pdf
    • https://cdn.shopify.com/s/files/1/0433/6828/4319/files/74534441401.pdf
    • https://cdn.shopify.com/s/files/1/0430/4030/9402/files/sunorimemuzafas.pdf
    • https://cdn.shopify.com/s/files/1/0428/5313/8591/files/bixipusadiwevani.pdf
    • https://cdn.shopify.com/s/files/1/0427/6905/5911/files/vugakewu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/69138800175.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/gonidaduribona.pdf
    • https://cdn.shopify.com/s/files/1/0435/4958/9668/files/lumifanogekefuba.pdf
    • https://cdn.shopify.com/s/files/1/0438/9086/8379/files/553345577.pdf
    • https://cdn.shopify.com/s/files/1/0432/0765/5579/files/zukaboxexawu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c11f.bin
5ce86c858c241b770cfd39994cb809ab6a99348c11fc3df4dc49fa6261913bc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC11F 5320 bytes
font_01_sfnt_off0000d2ff.bin
a04ef8b35da358620e277887f3869c4ab0e33aae3fe2b2d346812011cd87c37c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FF 10500 bytes

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