Malicious PDF — malware analysis report

Static analysis result for SHA-256 0335ae2ef1b458f9…

MALICIOUS

PDF

43.8 KB Created: 2020-08-11 00:40:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7118b40e24b78813aefde273b57f9181 SHA-1: 968ba036f3394965f5ffd5a857b8a41732cfbebd SHA-256: 0335ae2ef1b458f926cd604ffc0cb51486aa6d4b35a62833a86220cf4d4ba451
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic to disguise malicious intent. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to malicious infrastructure via embedded links.

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=mekanisme+parestesia+pdf
    • http://files.barrenoneballet.com/uploads/1/3/2/3/132303081/c7f3f.pdf
    • http://files.brownschoollibrary.com/uploads/1/3/2/6/132695492/voselemagorawakaso.pdf
    • http://files.theautosalons.com/uploads/1/3/0/7/130740524/7613141.pdf
    • http://sofen.mariadcortez.org/uploads/1/3/2/3/132303382/ec90c30b4e4a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6987/4080/files/5_point_likert_scale_questionnaire_sample.pdf
    • https://cdn.shopify.com/s/files/1/0430/9486/8122/files/gedovujekovuxakawa.pdf
    • https://cdn.shopify.com/s/files/1/0435/0204/3288/files/basaglar_package_insert.pdf
    • https://cdn.shopify.com/s/files/1/0433/0881/0398/files/88104087464.pdf
    • https://cdn.shopify.com/s/files/1/0438/3490/0642/files/fevawusurobejutew.pdf
    • https://cdn.shopify.com/s/files/1/0431/4746/0768/files/31584170789.pdf
    • https://cdn.shopify.com/s/files/1/0435/5060/5461/files/future_career_essay.pdf
    • https://cdn.shopify.com/s/files/1/0439/4477/1739/files/arduino_coding_learn.pdf
    • https://cdn.shopify.com/s/files/1/0430/9532/6887/files/87575984005.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38746106010.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89120948070.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/28969807022.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d03.bin
319725419cba0f136d9638c2741827fb4d4d420160bac97d62f63253ad792a09
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D03 5224 bytes
font_01_sfnt_off00007eb5.bin
265e2a017ee88ead3754d96fcf50ff19964a1ed7ddd033b25155e356b53c5ef7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB5 10452 bytes