Malicious PDF — malware analysis report

Static analysis result for SHA-256 24a3fdecf2ddd716…

MALICIOUS

PDF

42.8 KB Created: 2020-08-22 01:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8451f9b2fe07371b925300085f65867b SHA-1: bf0f64eae400ad44f43407fc863dc791b0185332 SHA-256: 24a3fdecf2ddd716c59bfdc72bb325e96fe9df2d32f9679357d194406c4b4ad4
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many of which point to external PDF files hosted on various domains. One URL, 'https://ttraff.ru/pify?keyword=ata+guidelines+thyroid+cancer+2017+pdf', is flagged as a malicious redirector. The presence of a link farm and a malicious redirector suggests an attempt to manipulate search engine results or redirect users to malicious content. The document body itself is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf.

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/pify?keyword=ata+guidelines+thyroid+cancer+2017+pdf
    • http://xedov.nicolefindlay.com/uploads/1/3/1/4/131407995/78a1b47f.pdf
    • http://files.iroiroproject.ch/uploads/1/3/2/7/132711954/553f7.pdf
    • http://tuwamibi.usceeri.com/uploads/1/3/1/6/131637021/9227714.pdf
    • http://pisikisa.clevelandschoolsfa.co.uk/uploads/1/3/1/4/131406344/ff165134e.pdf
    • http://mojajige.mathiasecology.com/uploads/1/3/0/7/130776031/musipodeda.pdf
    • https://cdn.shopify.com/s/files/1/0435/4015/2479/files/jurnal_nutrient_agar_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0431/2658/7549/files/reluzarofexabuvejaxulur.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6341/files/41008012039.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8711/files/boxabef.pdf
    • https://cdn.shopify.com/s/files/1/0462/5170/4469/files/birekujoji.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/guvademebiluw.pdf
    • https://cdn.shopify.com/s/files/1/0431/5522/6781/files/accounting_information_system_james_hall_solution_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/1322/4094/files/gba_emulator_roms_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2441/files/first_aid_step_3_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/1808/2711/files/jomogiwiduwebalokulivevo.pdf
    • https://cdn.shopify.com/s/files/1/0440/0575/2997/files/gogiruzopujorum.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_off000068dc.bin
c318d1bea3692e5a8445a728a1a2531ecff722d45de282d191cc97b8d1c223d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x68DC 5912 bytes
font_01_sfnt_off00007d0d.bin
4a5c4ebdfbddd1b37e336119c1a728873fd8dbdb6c218aa53d68303e476aea08
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D0D 9780 bytes