Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9caaa8319093d2f…

MALICIOUS

PDF

39.0 KB Created: 2020-08-31 06:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3e0109dd5dd614900a46668e3665bbb SHA-1: 96b54dfb3674d5478fc9da7c36872912f28e4f06 SHA-256: d9caaa8319093d2f629179a531399abaf02e9c19e728c7abc6b8cb547ff14f97
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that is disguised as a search result for a specific PDF document. This link leads to a known malicious infrastructure, indicating a phishing or social engineering attempt. The PDF also contains a large number of external links, many of which point to benign Shopify URLs, suggesting a link farm used for SEO poisoning to increase the visibility of the malicious redirector. No scripts were extracted from this sample.

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.ru/wix?keyword=physical+geology+plummer+carlson+hammersley+pdf
    • https://cdn.shopify.com/s/files/1/0431/2675/1389/files/79320551310.pdf
    • https://cdn.shopify.com/s/files/1/0431/6086/2882/files/gaxunidugipirigovus.pdf
    • https://cdn.shopify.com/s/files/1/0428/3655/7987/files/76514314038.pdf
    • https://cdn.shopify.com/s/files/1/0462/6812/1237/files/25744824419.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8628/files/13218392058.pdf
    • https://cdn.shopify.com/s/files/1/0428/9436/0735/files/printable_gradebook_template_editable.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9435/files/cyanide_and_happiness_apk_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/0922/0503/files/air_accident_reports_ireland.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/problem_solving_analysis.pdf
    • https://static.usrfiles.com/ugd/b8c837_335e42b09e474ea6aae944e6a41eac6f.pdf
    • https://static.usrfiles.com/ugd/bf650e_30bbb5bb036b4a3ba89c3439e451805d.pdf
    • https://static.usrfiles.com/ugd/739437_27f457373a9c4e368dc95082125bcabc.pdf
    • https://static.usrfiles.com/ugd/ac72e0_faff22dc5cee47ddb9e234923f49138f.pdf
    • https://static.usrfiles.com/ugd/ee6770_3fa4c423fbb94aef8e65cfefe75fe737.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_off000058e2.bin
42dad8d211e0f21122eeeb5374b0d369d6ce256bbe73d25296e36929d7f08167		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58E2 5672 bytes
font_01_sfnt_off00006c04.bin
8e0c5be5803ac21a4f4b20652ceed8d774d96aa1f756af5864878b3f27670fc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C04 10052 bytes

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