Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d40b58ac554599…

MALICIOUS

PDF

40.1 KB Created: 2020-08-17 17:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc68c4cc8eedeca74dae17076b8a042b SHA-1: cec13fe42e604ca6a74af0576646d1d6b350aa67 SHA-256: 45d40b58ac554599a61c7a487f41c749026671de1ba98bb382fb00d096745747
152 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous Shopify-hosted PDFs, with one primary link to a malicious redirector at ttraff.ru. This suggests a campaign to generate traffic or distribute malware via SEO-poisoned documents. The ML classifier strongly indicated maliciousness, and the PDF structure with duplicate objects is a common evasion technique. No scripts were extracted, but the primary attack vector appears to be the redirection to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=basic+accounting+cycle+pdf
    • http://files.dollarmovement.com/uploads/1/3/1/6/131636954/gimolamujemedikefut.pdf
    • https://cdn.shopify.com/s/files/1/0435/5240/7704/files/marxist_critical_theory.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/wenatubalanuxanitex.pdf
    • https://cdn.shopify.com/s/files/1/0437/8702/6590/files/homeland_s06e07_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jedufejaselikaruratemop.pdf
    • https://cdn.shopify.com/s/files/1/0434/6734/1974/files/adjectives_personality_list.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xigazisamakolomomabixefox.pdf
    • https://cdn.shopify.com/s/files/1/0429/5717/6986/files/23006659648.pdf
    • https://cdn.shopify.com/s/files/1/0434/1989/3927/files/truth_table_in_logic.pdf
    • https://cdn.shopify.com/s/files/1/0431/2324/5216/files/hello_kitty_coloring_book.pdf
    • https://cdn.shopify.com/s/files/1/0446/9266/8570/files/octonauts_creature_report_algae.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowojemabedeju.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_off00005e4a.bin
53845422d34c5553cf68f3a4551582b748d576ea0655ecf2267b32f6acb2aebc
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E4A 5376 bytes
font_01_sfnt_off000070af.bin
c818790cc0b4d4f8e57d546f7ea297b6ee74e3fbb95a44641c7ecf58673fa677
pdf-font-stream PDF embedded font (sfnt) at offset 0x70AF 10364 bytes