Malicious PDF — malware analysis report

Static analysis result for SHA-256 41bf3759aa92b93e…

MALICIOUS

PDF

46.0 KB Created: 2020-08-14 21:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a9ca1cc59c2bc95d9fb974932de1b17 SHA-1: 1b96b71d738de08d6dcdccedb12d0bba4ebb2391 SHA-256: 41bf3759aa92b93e50a80eceff22c4642d4ebff999ce75dfab1ebff1c0a0cdd0
128 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, including one identified as a malicious redirector (ttraff.ru). The presence of a 'download button' heuristic and the document body text mentioning 'Docx file to pdf' suggests a lure to trick the user into clicking the malicious link. The redirector likely leads to further malicious content or exploits. The sample also contains a large number of links to Shopify-hosted PDFs, some of which are benign, but the overall pattern indicates a link farm used for SEO poisoning or distributing malicious content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=docx%20file%20to%20pdf
    • http://vovax.roydesignedthat.com/uploads/1/3/1/3/131398101/0818cc31.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1625/files/bijivax.pdf
    • https://cdn.shopify.com/s/files/1/0430/1671/6437/files/posodufalolipativavijed.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94608223162.pdf
    • https://cdn.shopify.com/s/files/1/0431/9631/7845/files/wigizizufewagabi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5802/8959/files/38872129028.pdf
    • https://cdn.shopify.com/s/files/1/0428/2476/1507/files/bigegiroferag.pdf
    • https://cdn.shopify.com/s/files/1/0430/9054/2753/files/uniden_atlantis_250_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/1648/6040/files/zawedajurelirepa.pdf
    • https://cdn.shopify.com/s/files/1/0435/3179/6629/files/livajebax.pdf
    • https://cdn.shopify.com/s/files/1/0435/7170/8065/files/kulixavepuwagonemapumago.pdf
    • https://cdn.shopify.com/s/files/1/0431/9356/5342/files/99001526740.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060eb.bin
9d44372cdf542170751c89e707cb6f21dccadf84961bb4c95ede2d1ad7355493
pdf-font-stream PDF embedded font (sfnt) at offset 0x60EB 4732 bytes
font_01_sfnt_off0000711e.bin
3caa76071487d9d881b26557962e05690a3a570078f27ea5101df4a7b019fb23
pdf-font-stream PDF embedded font (sfnt) at offset 0x711E 10728 bytes
font_02_sfnt_off000095f4.bin
9c47a8ecf7103172530608de19fa11afb8a035ab51042e9cb8c6809f09ebb189
pdf-font-stream PDF embedded font (sfnt) at offset 0x95F4 16344 bytes