Malicious PDF — malware analysis report

Static analysis result for SHA-256 998e9ed9eb285138…

MALICIOUS

PDF

41.3 KB Created: 2020-08-31 06:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb590b874dfe3d2139b8906ae54ec62c SHA-1: c406ec91b164b358b51cef0baf06a732acebfa33 SHA-256: 998e9ed9eb2851380635a9f5c94619499423c28134bdfe5f7f569f3335d439a4
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is indicative of a link farm. One critical heuristic identified a link to a known malicious redirector, ttraff.cc. The ML classifier also strongly flagged this PDF as malicious. The document body contains the title 'Signs and symbols of baptism' and the malicious redirector URL, suggesting a lure to disguise the malicious intent.

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.cc/wix?keyword=signs+and+symbols+of+baptism
    • https://cdn.shopify.com/s/files/1/0431/1721/5905/files/7537357054.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/17051104657.pdf
    • https://cdn.shopify.com/s/files/1/0430/1075/2663/files/67796290953.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/63737439820.pdf
    • https://cdn.shopify.com/s/files/1/0435/7269/1099/files/analytic_geometry_grade_10.pdf
    • https://static.usrfiles.com/ugd/d216cb_8313cb7668f54868859d32c1842f69c8.pdf
    • https://static.usrfiles.com/ugd/ca9b0a_350da9e9695247299136e9813bac8389.pdf
    • https://cdn.shopify.com/s/files/1/0433/4351/1706/files/21524526692.pdf
    • https://cdn.shopify.com/s/files/1/0432/2151/6449/files/juwabomodikebel.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32505595602.pdf
    • https://cdn.shopify.com/s/files/1/0429/8778/2297/files/gedix.pdf
    • https://cdn.shopify.com/s/files/1/0431/4107/1016/files/13387201389.pdf
    • https://cdn.shopify.com/s/files/1/0434/5469/3537/files/bio_energy_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0435/3766/2103/files/absolute_value_equations_word_problems_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/2996/9561/files/l_adjectif_possessif_exercices.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_off0000646f.bin
c7c35aabc325e5a083ef96f53c598f9416489aa7846b426792e56372b12cc3f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x646F 5612 bytes
font_01_sfnt_off0000776a.bin
b0537e99286496117cdb6fb0faf3e0754f3e0f79555d35e480b10fa3adc48824
pdf-font-stream PDF embedded font (sfnt) at offset 0x776A 9768 bytes