Malicious PDF — malware analysis report

Static analysis result for SHA-256 9788b67248d15a63…

MALICIOUS

PDF

60.5 KB Created: 2020-08-04 21:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fc98196ba66e77b1c3feed205e01da8 SHA-1: 3c371ea751fe94693fcd387de38c67bdefa3b4a1 SHA-256: 9788b67248d15a636151ed667874c7dfdd6af772ff49d7da4eaa5b2edb2d0df3
120 Risk Score

Malware Insights

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

The PDF file was identified as a malicious redirector due to the presence of numerous embedded links. One critical heuristic firing indicates a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=procalcitonina+valores+normales+pdf'. Another heuristic flagged a large number of external PDF links, suggesting a link farm or SEO poisoning attempt, with 'https://cdn.shopify.com/s/files/1/0429/3728/6815/files/naruto_op_13.pdf' being the first identified. The document body contains garbled text but includes the same suspicious URL and several benign-looking Shopify URLs.

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=procalcitonina+valores+normales+pdf
    • http://files.childrenareourspecialty.com/uploads/1/3/0/8/130814531/83c371c7dde.pdf
    • http://files.hillarytrailadventures.co.nz/uploads/1/3/1/6/131636946/1473492.pdf
    • http://files.ojmfarmcontractors.co.uk/uploads/1/3/2/6/132682090/cdb79f475.pdf
    • https://cdn.shopify.com/s/files/1/0429/3728/6815/files/naruto_op_13.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9560/files/43560876829.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6004/files/2031670553.pdf
    • https://cdn.shopify.com/s/files/1/0434/6583/4658/files/rimobesapurizelimisunux.pdf
    • https://cdn.shopify.com/s/files/1/0435/4247/9000/files/moteliwidezunuvagunim.pdf
    • https://cdn.shopify.com/s/files/1/0434/6576/9110/files/3925640858.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5312/files/jexewemapinuzefovetu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5448/7957/files/circular_motion_questions_and_answers_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/xajokal.pdf
    • https://cdn.shopify.com/s/files/1/0431/8406/2622/files/bocadillos_menu_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0431/3009/3728/files/rakozujisina.pdf
    • https://cdn.shopify.com/s/files/1/0428/2990/6079/files/47844678925.pdf
    • https://cdn.shopify.com/s/files/1/0437/1503/5291/files/manual_rebar_bender.pdf
    • https://cdn.shopify.com/s/files/1/0438/3653/9045/files/49017385288.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_off0000aa98.bin
948d8452b3fba573d6867a6ce8647c9880317b3ec65f2d3c20d69f227b6d86ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xAA98 5364 bytes
font_01_sfnt_off0000bcc5.bin
36b6b138ee590cfe25fad5bb2d556a1a0d0dedd7298ddfd274b257565af0b3e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC5 11888 bytes