Malicious PDF — malware analysis report

Static analysis result for SHA-256 35aa05da6fd4f997…

MALICIOUS

PDF

43.3 KB Created: 2020-08-30 06:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa2c84be15230e864d1e05f5f074bb19 SHA-1: c21be4c9a9f10a7b40043919695926f0bb1d70ae SHA-256: 35aa05da6fd4f9972f2348026c5c126b157cd323deab5a299ac863243b9611dc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/wix?keyword=voz+passiva+ingles+exercicios+resolvidos', which is flagged as a malicious redirector. This suggests the document's primary purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing.

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=voz+passiva+ingles+exercicios+resolvidos
    • https://static.usrfiles.com/ugd/0dd040_a06d9475504442c68523b21af3509c16.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b7f1198c9ab4663a76fb94b60f81851.pdf
    • https://static.usrfiles.com/ugd/6240f8_8348f869ea2a4b4196272b455bf254f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f19fccfaa3946ce9e5e591fb39577f8.pdf
    • https://static.usrfiles.com/ugd/3b7182_71ecb96a093a4d85b6a94913815dc88c.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/88714050592.pdf
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/masajexoxafonurudoto.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/63405348965.pdf
    • https://cdn.shopify.com/s/files/1/0435/9471/1203/files/david_muir_boyfriend.pdf
    • https://cdn.shopify.com/s/files/1/0431/1737/9750/files/may_the_angels_lead_you_into_paradise.pdf
    • https://static.usrfiles.com/ugd/ce14f3_dbd375af86dc48af96596060a925a3a7.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9e49ccab4d2473b92c51524267b7cea.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_428be5f521f64656a402df7f557480e6.pdf
    • https://cdn.shopify.com/s/files/1/0427/7963/9967/files/51686660596.pdf
    • https://cdn.shopify.com/s/files/1/0433/3705/6415/files/curso_de_carpintaria_e_marcenaria.pdf
    • https://cdn.shopify.com/s/files/1/0432/0028/2783/files/19452062310.pdf
    • https://cdn.shopify.com/s/files/1/0434/7500/9698/files/silent_words_in_english_a_to_z.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e5b.bin
f8324af30f73084e4162a5e92d0737635682b18f6d1a7abf13ea66e5bf22ddaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E5B 5384 bytes
font_01_sfnt_off000070bb.bin
7f1fc89d230b21cdf1c6da576e651cd8d1038c1fc087e797b2b55c3b3618ee60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70BB 1852 bytes
font_02_sfnt_off00007990.bin
6b1cf52ad0c767f25a8eaeff16f47f4981d952127a443da66745b3a67b46182e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7990 11780 bytes

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