Malicious PDF — malware analysis report

Static analysis result for SHA-256 be91b524bb41249e…

MALICIOUS

PDF

39.3 KB Created: 2020-08-22 11:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08ba7bec86917fcd7ab94f2bb55f684a SHA-1: d696c7a0298699443d57a528a7c21ce7caacecaf SHA-256: be91b524bb41249e09d85edfe1d628aba2f55b9a5dec99ea73d0e3451a612fd9
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains, but one critical link directs to `ttraff.com`, identified as a malicious redirector. This suggests the document is part of a link farm designed to obscure the ultimate malicious destination. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the presence of the malicious redirector indicates a likely phishing or malware delivery attempt.

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.com/pify?keyword=aldehydes+and+ketones+laboratory+report
    • http://lakeba.raceacrossoregon.com/uploads/1/3/1/3/131398140/voguz-julon.pdf
    • http://files.gravediggersball.org/uploads/1/3/1/3/131380171/wufazoxebovomugu.pdf
    • http://jenalidi.goldenrodhistoricalsociety.com/uploads/1/3/0/8/130814328/pedotodaxureforudu.pdf
    • http://dawam.artandeyecandy.com/uploads/1/3/2/7/132712461/9905477.pdf
    • https://cdn.shopify.com/s/files/1/0437/0857/9993/files/susinesisawotuwur.pdf
    • https://cdn.shopify.com/s/files/1/0428/5582/5567/files/82652967572.pdf
    • https://cdn.shopify.com/s/files/1/0433/0940/0214/files/calligraphy_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6327/files/74402863302.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/gujutoge.pdf
    • https://cdn.shopify.com/s/files/1/0431/8432/4770/files/pasataliwifukewekupubaxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6843/2288/files/bonefish_grill_nutrition_information.pdf
    • https://cdn.shopify.com/s/files/1/0434/6268/8918/files/historia_del_basquetbol_en_chile.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_off00005c37.bin
4a4fe47025247a46367e063cb57c88a9e633a530eca0453c05b90c4afc387d21
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C37 5344 bytes
font_01_sfnt_off00006e50.bin
919b4bf410b415f4c92ab2240d3a7bf5491b452d49067099e52e16ad65be9f6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E50 9996 bytes