Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ad739d5cfcd75b…

MALICIOUS

PDF

44.1 KB Created: 2020-08-10 17:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 931d95df0f836f90c0254f782c519c46 SHA-1: 733b373d70fdef5e5e48bd4e51114e180d0fbfd0 SHA-256: 78ad739d5cfcd75b16f8cc6ec0e9172aa94368dc0059e6c8a66aed7fe79a9431
120 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure at https://ttraff.cc/pify?keyword=certificado+mei+pdf. Another heuristic indicates a large number of external PDF links, suggesting a link farm. The document body, though heavily obfuscated, also contains the malicious URL and several other Shopify-hosted PDF links. The primary attack pattern involves tricking the user into clicking the malicious redirector link.

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=certificado+mei+pdf
    • http://files.pictonlittletheatre.com/uploads/1/3/0/7/130739101/gebasepug.pdf
    • http://files.swissblisstravel.co.uk/uploads/1/3/2/3/132303175/7711811.pdf
    • http://files.joyellamills.com/uploads/1/3/0/7/130775223/wibofekow_gisolaveri.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3749/files/abdomen_agudo_medigraphic.pdf
    • https://cdn.shopify.com/s/files/1/0437/1811/5480/files/96499543484.pdf
    • https://cdn.shopify.com/s/files/1/0431/2550/6208/files/lebojumokefatarozod.pdf
    • https://cdn.shopify.com/s/files/1/0432/5241/6672/files/27756317037.pdf
    • https://cdn.shopify.com/s/files/1/0434/6842/3330/files/27395330889.pdf
    • https://cdn.shopify.com/s/files/1/0431/9431/9009/files/hebrew_bible_online.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/pasetin.pdf
    • https://cdn.shopify.com/s/files/1/0428/2544/9628/files/xujodakiritu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1345/6550/files/divivoromaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/medicinal_and_aromatic_plants_of_nepal.pdf
    • https://cdn.shopify.com/s/files/1/0427/6604/1244/files/jipuz.pdf
    • https://cdn.shopify.com/s/files/1/0427/9202/6271/files/97545570399.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/
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a0a.bin
86efc059811d3adbc71b1ac13d9b7982edb2e867bcc7707c6cf91fc2e946a536		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0A 4996 bytes
font_01_sfnt_off00007aeb.bin
b1f026b2d026f15e0eacc4d5e1c9eccc690663d433a325588eae94212ec26300		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AEB 12236 bytes

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