Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba7ba5be1f5a65a…

MALICIOUS

PDF

39.3 KB Created: 2020-08-07 07:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b0fec4a439bebb2bf5404b9418d51ce SHA-1: 761aab9834c631744ae64ce61b9e395dfa1d65bd SHA-256: 3ba7ba5be1f5a65a5b5f223fe183c11885dd65f28136f7133b89073296dd63fa
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, 'ttraff.cc', which is likely the primary malicious payload delivery mechanism. The document body text, while appearing benign, is used to mask the malicious intent of the embedded links.

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/wb?keyword=consonant%20blend%20worksheets%20kindergarten
    • http://files.bluewrenadventures.com/uploads/1/3/1/4/131437701/4911640.pdf
    • http://files.zulemasummerfield.net/uploads/1/3/2/6/132695339/7002655.pdf
    • http://files.ahleithner.com/uploads/1/3/0/8/130874213/de0d9daa2534.pdf
    • http://files.sirjohncassprimary.org/uploads/1/3/2/7/132741322/2533994.pdf
    • http://zoridov.theoslerfunds.com/uploads/1/3/1/8/131872225/xewojip-pofas.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0719/files/tebovonanutaxonod.pdf
    • https://cdn.shopify.com/s/files/1/0432/2672/6568/files/todojosubujugotekatelopuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/1695/3751/files/72997254167.pdf
    • https://cdn.shopify.com/s/files/1/0433/8653/6092/files/vademecum_aceites_esenciales.pdf
    • https://cdn.shopify.com/s/files/1/0430/1458/6521/files/19920432128.pdf
    • https://cdn.shopify.com/s/files/1/0433/4357/7256/files/70387286937.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/gidadoxi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7290/3585/files/77221464254.pdf
    • https://cdn.shopify.com/s/files/1/0435/8524/1256/files/nosemapitavipebogokuzume.pdf
    • https://cdn.shopify.com/s/files/1/0435/8039/1585/files/fisica_acustica_fonoaudiologia.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/memew.pdf
    • https://cdn.shopify.com/s/files/1/0437/5350/4917/files/mpeg_4_converters.pdf
    • https://cdn.shopify.com/s/files/1/0435/8488/0798/files/ninofasoriwaderawekozokud.pdf
    • https://cdn.shopify.com/s/files/1/0435/0866/2440/files/lomiferivewu.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_off00005c72.bin
4e31fd62b35f9f7a932d43413b2bd728b68d164a338361bd471084f24052e1a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C72 5288 bytes
font_01_sfnt_off00006e6d.bin
c16fb347d67175291891eaa7d0943a3d03db096e16dfdeb7844d82ad801ce388
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E6D 9640 bytes