Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4fbbdef34e2fe9b…

MALICIOUS

PDF

46.0 KB Created: 2020-08-08 07:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c727cc5e778830ac83eaaef388a66ae SHA-1: 6c49d2e2bfcdcf7970c8a6434c9774a243877f84 SHA-256: b4fbbdef34e2fe9bab305e60c687d492ca7e5c37bb0eaff312f8c38afcd8d938
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination of the malicious payload. The document also exhibits characteristics of a link farm, with numerous embedded links to other PDFs, many hosted on cdn.shopify.com. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious redirector and the link farm structure indicate a delivery mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=arch%25C3%25A9ologie+du+savoir+pdf
    • http://files.bbawakeblogs.com/uploads/1/3/1/4/131437268/66807.pdf
    • http://files.themixyouthcooperative.com/uploads/1/3/1/3/131383045/niwetu-burun-temosofo.pdf
    • http://files.hyperlexiabtb.com/uploads/1/3/1/4/131453943/2782548.pdf
    • https://cdn.shopify.com/s/files/1/0431/2567/0037/files/416351594.pdf
    • https://cdn.shopify.com/s/files/1/0437/5920/6558/files/animal_farm_full_text.pdf
    • https://cdn.shopify.com/s/files/1/0431/0017/6544/files/39276849059.pdf
    • https://cdn.shopify.com/s/files/1/0431/5535/7852/files/mystery_case_files_ravenhearst.pdf
    • https://cdn.shopify.com/s/files/1/0439/2206/3515/files/free_construction_proposal_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/1223/5174/files/connectors_list_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0429/6366/5062/files/denubesoribevexuxomuzuto.pdf
    • https://cdn.shopify.com/s/files/1/0435/1682/1672/files/wumuxelurilekobamumorumo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2590/8383/files/42471346243.pdf
    • https://cdn.shopify.com/s/files/1/0432/8436/5468/files/dalitopomotubolazarafija.pdf
    • https://cdn.shopify.com/s/files/1/0433/2699/6633/files/13566874300.pdf
    • https://cdn.shopify.com/s/files/1/0433/0268/2789/files/tutakogobivifonolanu.pdf
    • https://cdn.shopify.com/s/files/1/0440/6879/8614/files/62224784914.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_off00006ec3.bin
45abab7bcf69fd25b965f21aecc721b86677c9eac65305901aa4d484f88df3d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC3 5608 bytes
font_01_sfnt_off00008198.bin
03cf5c63826e8729070ea66f88f09e7ea776f618b159b5034bb16a938e625788		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8198 12576 bytes

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