Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb67185c3373451…

MALICIOUS

PDF

38.8 KB Created: 2020-08-29 12:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec446c1d4ef672869078e6a3fdfd404e SHA-1: be9a4a1696e4e6dd66966a0531edcfa0fd15d567 SHA-256: 4eb67185c33734510c7a31dc5e8d283c2606f9ed6a59544a331d591a9537e0f8
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits a PDF link farm heuristic, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious. The document body contains the malicious URL and appears to be a lure for 'que es un elemento representativo'. No scripts were extracted from this sample.

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=que+es+un+elemento+representativo
    • https://cdn.shopify.com/s/files/1/0430/9745/6789/files/94035113306.pdf
    • https://cdn.shopify.com/s/files/1/0436/5503/7078/files/rbi_grade_b_online_form_2019.pdf
    • https://cdn.shopify.com/s/files/1/0430/5004/1495/files/96968073097.pdf
    • https://cdn.shopify.com/s/files/1/0463/6151/0043/files/tifovelofemijid.pdf
    • https://cdn.shopify.com/s/files/1/0435/4703/3752/files/wefonafapexubizupusi.pdf
    • https://static.usrfiles.com/ugd/b8c837_7e02755ea7f64cb2ba3cd4a7f15fa134.pdf
    • https://static.usrfiles.com/ugd/b8c837_70fa9ad2f64145bc96ffa54f0b6d7146.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ef0b7b5cfa94282a8fa342ea28f6974.pdf
    • https://cdn.shopify.com/s/files/1/0435/0866/2440/files/2763117048.pdf
    • https://cdn.shopify.com/s/files/1/0433/1044/8795/files/yugioh_gx_episode_156.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_off00005894.bin
76c6282d61b3f3b4d9949607ef209c9333965a355034e257d53884683445d60f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5894 5084 bytes
font_01_sfnt_off000069cb.bin
743a00b1f1c52846df3a42fbf085d46f5473e3dd0903cc0b4427c12a59c6c321		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69CB 10932 bytes

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