Malicious PDF — malware analysis report

Static analysis result for SHA-256 7daa20c3f4b9d5ea…

MALICIOUS

PDF

44.1 KB Created: 2020-07-30 05:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2334337693ebe8b635d010f638700dbc SHA-1: f0865edae82a12d507b00175343a93385db4d4d5 SHA-256: 7daa20c3f4b9d5eaa730141a4b26b489870d9110793e583486895d3733e675da
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified it as a PDF link farm, with many links pointing to shopify.com domains, likely as a means to obscure the ultimate destination. The primary malicious URL identified is 'https://ttraff.com/pify?keyword=brochure+content+pdf', which is a known malicious redirector. The document body is heavily obfuscated and appears to be generated content, further supporting the malicious intent of redirecting users.

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.com/pify?keyword=brochure+content+pdf
    • http://files.haisleyptoauction.org/uploads/1/3/1/4/131454556/jimutifomawefab_poroputob_buwagipufewojig.pdf
    • http://files.drilldirect.com/uploads/1/3/2/8/132814680/fuxidogowasi.pdf
    • http://files.kandopuppies.com/uploads/1/3/1/3/131398125/mexeno.pdf
    • http://files.kandopuppies.c
    • https://cdn.shopify.com/s/files/1/0431/6574/5314/files/35379523485.pdf
    • https://cdn.shopify.com/s/files/1/0440/6876/5848/files/nejasikegiborodalekanu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5682/4471/files/75992783177.pdf
    • https://cdn.shopify.com/s/files/1/0429/8060/6111/files/51720349479.pdf
    • https://cdn.shopify.com/s/files/1/0434/8697/0018/files/34606266401.pdf
    • https://cdn.shopify.com/s/files/1/0432/4845/1739/files/74498100649.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/14832833782.pdf
    • https://cdn.shopify.com/s/files/1/0434/1514/2551/files/fakufugogorudu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8922/2037/files/kedalupexijaju.pdf
    • https://cdn.shopify.com/s/files/1/0430/8982/1845/files/76040361080.pdf
    • https://cdn.shopify.com/s/files/1/0427/8734/0454/files/14111868378.pdf
    • https://cdn.shopify.com/s/files/1/0434/9011/5736/files/77207841592.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_off0000715a.bin
b1f9ab35b1e37f8bcf66847e0738066f4e99c16367f6e89b575024fce8c5ed0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x715A 4708 bytes
font_01_sfnt_off0000814c.bin
acf16090166f8c37710198ae118e1069486e6807c72e667a3c28dfc2b4ca696a
pdf-font-stream PDF embedded font (sfnt) at offset 0x814C 9900 bytes