Malicious PDF — malware analysis report

Static analysis result for SHA-256 757c73673d52c249…

MALICIOUS

PDF

43.0 KB Created: 2020-08-29 21:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e559003bdb51ac8565bd71856b467461 SHA-1: 776c82b65d3becffedce21ff6d267fd101f9c252 SHA-256: 757c73673d52c24977f21f838441f8cc91d1de71e844a0f6fae1f43296e86555
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and references to other PDFs, suggesting a link farm or redirection scheme.

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/wix?keyword=honda+hrc215+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/fanorupiseniromewazupafux.pdf
    • https://cdn.shopify.com/s/files/1/0431/9199/2480/files/6618318496.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xovigaza.pdf
    • https://static.usrfiles.com/ugd/5ecadc_4163e2adf4d44870880b91056758824b.pdf
    • https://static.usrfiles.com/ugd/49be48_601ba8a6f6eb437ba8bff86fc587fe5a.pdf
    • https://cdn.shopify.com/s/files/1/0428/2236/9446/files/kevin_gates_told_me_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/6809/6661/files/pacific_highlands_ranch_new_homes_san_diego.pdf
    • https://cdn.shopify.com/s/files/1/0434/1753/4629/files/24888767742.pdf
    • https://cdn.shopify.com/s/files/1/0430/3686/8762/files/28756368586.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1354/files/49103320156.pdf
    • https://cdn.shopify.com/s/files/1/0433/7857/3464/files/37615614654.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5505/files/68818913613.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_off000062a5.bin
79bf0769c061a40c615241a58d09ed2314ac5097050719c7d07e42c50bff3655
pdf-font-stream PDF embedded font (sfnt) at offset 0x62A5 5272 bytes
font_01_sfnt_off00007468.bin
43318a1f6bf3595e659a9d47c4e159eb23a8a7e52a997b92e9f4582ef396a513
pdf-font-stream PDF embedded font (sfnt) at offset 0x7468 14100 bytes