Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb5546108e4b329…

MALICIOUS

PDF

43.2 KB Created: 2020-08-30 06:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08076e894deadee4c46cdd6cd28717e5 SHA-1: 5856ab59218f61e8bf1feb134b6182bc688f2006 SHA-256: 2cb5546108e4b329d3220d59fedbbb0ceab82cef6118ef09b7a0f657834140a6
152 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, indicating an attempt to generate traffic or distribute content. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting the primary intent is to redirect the user to this malicious site.

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=instant+pot+cooking+times+frozen+meat
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/biography_walt_disney.pdf
    • https://cdn.shopify.com/s/files/1/0432/7931/9196/files/43842099216.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4628/files/speech_evaluation_form.pdf
    • https://cdn.shopify.com/s/files/1/0438/8736/2216/files/76763918872.pdf
    • https://cdn.shopify.com/s/files/1/0438/3775/1456/files/2301055673.pdf
    • https://cdn.shopify.com/s/files/1/0432/2361/3595/files/83868105057.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/after_effects_cs6_intro_templates_free.pdf
    • https://static.usrfiles.com/ugd/67e251_fc4a0c7f17ec46778399059a4543abf2.pdf
    • https://static.usrfiles.com/ugd/963627_ae4054759e20474bad7b58905a66a5d2.pdf
    • https://static.usrfiles.com/ugd/bf650e_25e542918c6a47e396772fbe98a191f3.pdf
    • https://static.usrfiles.com/ugd/b77b08_e461b7e065e24985a0259ba140e87ffe.pdf
    • https://static.usrfiles.com/ugd/b8c837_255a84215a284ca88d45dcb08a210a2e.pdf
    • https://static.usrfiles.com/ugd/086daf_600999aedf5c43b59836aa99c0baa80f.pdf
    • https://static.usrfiles.com/ugd/b8c837_4e3e827f545842c9ad5eab9ce9d56d32.pdf
    • https://static.usrfiles.com/ugd/9dda13_e6482b9bedc6492190a8ca94dc8a2376.pdf
    • https://static.usrfiles.com/ugd/f4de5e_1e3efbcc491b403c878bac70ae8dba03.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/
    • https://static.usrfiles.com

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006aae.bin
8e8cb7dd6ba4633998c86e4aa94f7c9a134acd5db5369c701f6cb9587675aa07
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AAE 5356 bytes
font_01_sfnt_off00007cd6.bin
e2fe5b150e5aa1867fc6c97277cd0dd48b4dcd19ced12b62c67ed4351510a710
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD6 10140 bytes