Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5078f81104337a…

MALICIOUS

PDF

136.6 KB Created: 2020-08-01 21:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dacfdc8ca0d79994f4103ced91408d7 SHA-1: 8c9645c26b5f55317fc2c5c0314dd57d92832bc6 SHA-256: 2a5078f81104337a429cf98869d72c26469abb8903975acdff11e563da3fef1b
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a known malicious redirector. The ML classifier also flagged this PDF as malicious. The presence of numerous links, including one to a suspicious domain, suggests a phishing or malware distribution attempt. No scripts were extracted, and the document body was heavily obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/pify?keyword=is+sam+smith+married
    • http://files.jmshairdesign.com/uploads/1/3/1/3/131380456/kowutivig_ragotimewis_tisifemow.pdf
    • http://files.meadowcreekcstx.com/uploads/1/3/0/8/130815014/6cccef436bf3.pdf
    • http://files.positivepreggos.com/uploads/1/3/2/3/132302993/wukodunobi-kusuxin-reketixexuf.pdf
    • http://files.lodgefarmleisure.com/uploads/1/3/1/4/131452958/2389207.pdf
    • https://cdn.shopify.com/s/files/1/0429/3866/3079/files/22273496337.pdf
    • https://cdn.shopify.com/s/files/1/0431/0266/6914/files/67672136167.pdf
    • https://cdn.shopify.com/s/files/1/0427/9658/1020/files/74748697729.pdf
    • https://cdn.shopify.com/s/files/1/0437/8951/6962/files/rekolu.pdf
    • https://cdn.shopify.com/s/files/1/0436/0352/5794/files/dodge_neon_srt4_top_speed.pdf
    • https://cdn.shopify.com/s/files/1/0431/4890/2560/files/81750974084.pdf
    • https://cdn.shopify.com/s/files/1/0440/9029/4437/files/masegowivajodibobuguniv.pdf
    • https://cdn.shopify.com/s/files/1/0430/0524/7647/files/gezozafaritod.pdf
    • https://cdn.shopify.com/s/files/1/0434/7356/7901/files/last_logged_on_user_registry.pdf
    • https://cdn.shopify.com/s/files/1/0430/8851/1130/files/52723342915.pdf
    • https://cdn.shopify.com/s/files/1/0429/4737/9356/files/54974596832.pdf
    • https://cdn.shopify.com/s/files/1/0433/0386/2440/files/fowixivopepazotelena.pdf
    • https://cdn.shopify.com/s/files/1/0431/1800/2340/files/damelawisefewixosopu.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_off0001cfb8.bin
5d7fde1a9cbc056ba8d7b3d2ef6d64c9330dd5709949bb3a823a1ddfa0cf8132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFB8 4972 bytes
font_01_sfnt_off0001e064.bin
4400168878f181eef2a4d47d683ce8adbee61eacdc1a19a1da99c9998e062082		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E064 4132 bytes
font_02_sfnt_off0001ed73.bin
75a04afe2c83181b7a87ceedc8beb7f45cce9ce51faaa1573c75d65f8d2125f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED73 11364 bytes

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