Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb78764b908812f7…

MALICIOUS

PDF

45.8 KB Created: 2020-08-17 10:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acd5a1c382207bb1d303348bbe9a38f6 SHA-1: 342b61d78e17cdad3904fb0f22dc88b2b92b11cb SHA-256: fb78764b908812f750aa57d1f84481b46a42431d890153a438cf5dd49f1202de
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a 'board of directors resolution form'. This link, 'https://ttraff.com/pify?keyword=board+of+directors+resolution+form', points to known malicious infrastructure. The document also functions as a link farm, embedding numerous external PDF links, many of which lead to Shopify domains, likely for SEO poisoning or to obscure the malicious redirector. The ML classifier strongly indicates malicious intent.

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/pify?keyword=board+of+directors+resolution+form
    • http://zoniw.sebaacademyschool.com/uploads/1/3/1/4/131407711/pidosivezu.pdf
    • http://wevinogu.journeyomyoga.com/uploads/1/3/1/3/131378985/majawirufepon.pdf
    • https://cdn.shopify.com/s/files/1/0432/3924/3943/files/9142510250.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5816/files/msaccess_date_functions.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1776/files/jokosu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46150969179.pdf
    • https://cdn.shopify.com/s/files/1/0429/8529/1937/files/60154603088.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/lijenukokuburaxikage.pdf
    • https://cdn.shopify.com/s/files/1/0439/3120/5787/files/61048697642.pdf
    • https://cdn.shopify.com/s/files/1/0434/8762/5369/files/birla_mutual_fund_common_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0441/1208/5144/files/nasaligaxokabobafaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3458/files/tixifusimite.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6017/files/kugidopir.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_off0000775a.bin
87c2f483fd8e7efb9aef02f4832c4e00027d895c53d8f1437453ac17b1ed4f45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x775A 5216 bytes
font_01_sfnt_off000088fa.bin
ebae42bdeabc2b399dd243cc4b2e319336c8a463edabe8200922e1011f7ecdde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88FA 9832 bytes

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