Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6bed9c899d97911…

MALICIOUS

PDF

45.0 KB Created: 2020-08-25 04:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f7ab06c9de82ab05430b5ce42306b68 SHA-1: bb0004bcd0f1d2ffea613ac653dc71eadb08c9ac SHA-256: a6bed9c899d9791162dc24218471e553e9aa667dd5fb2243d9b3ad2d5b69f1b1
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious redirector URL and numerous other URLs pointing to PDFs hosted on Shopify, suggesting a link farm or SEO manipulation tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=proper+barbell+overhead+press+form
    • http://files.top-tungsten.com/uploads/1/3/0/7/130775129/516ee74d4.pdf
    • http://files.ventana-abierta.es/uploads/1/3/2/8/132814022/vonaxusuwis_bevikabesafob.pdf
    • http://files.liberationgifts.com/uploads/1/3/2/6/132681452/517904.pdf
    • https://cdn.shopify.com/s/files/1/0431/2072/2080/files/antigone_critical_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0428/3252/7526/files/ccs_university_ba_online_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/3502/5831/files/lusesipogis.pdf
    • https://cdn.shopify.com/s/files/1/0447/9166/0695/files/nujowonogixujafusi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2484/9815/files/taking_action_on_adolescent_literacy.pdf
    • https://cdn.shopify.com/s/files/1/0432/9914/3838/files/nelutavemenolixemovu.pdf
    • https://cdn.shopify.com/s/files/1/0439/1400/2587/files/functional_programming_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rowogumidakedodovejizana.pdf
    • https://cdn.shopify.com/s/files/1/0429/6749/8911/files/a_clockwork_orange_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/4896/8090/files/23533311478.pdf
    • https://cdn.shopify.com/s/files/1/0463/1196/4829/files/39088439786.pdf
    • https://cdn.shopify.com/s/files/1/0430/7556/7770/files/us_citizenship_questions_and_answers_in_spanish.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_off0000723b.bin
3ea81bbea38630c3ea00b440ac52f92decaa50d7dbc3397719852c2da010b66b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x723B 5480 bytes
font_01_sfnt_off000084b3.bin
eeb1382b371de52b76ca2f6c4db146ebf7cd16b29c92f3d20de83a130d86ab07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84B3 10060 bytes

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