Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d5e43e8132734e…

MALICIOUS

PDF

51.1 KB Created: 2020-08-08 11:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26bcbcecfd8675d1f48722ef6dc95b77 SHA-1: cdafecccbeffb38202a5fb545fcd5b483fe2fd02 SHA-256: f3d5e43e8132734e8ef28c85f7067159990be320718cd652a78ffbdb2075a598
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the redirector heuristic. The primary purpose appears to be SEO-based link farming, directing users to potentially malicious or unwanted content through a redirector.

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/pify?keyword=abortus+medisinalis+adalah+pdf
    • http://files.ndsubisonrobotics.org/uploads/1/3/2/6/132696512/8106537.pdf
    • http://files.wormfoodforthough.net/uploads/1/3/0/9/130969243/e9c22e71c4f8.pdf
    • http://gijik.jq-photography.com/uploads/1/3/1/6/131606758/sonibuj.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9814/files/xvideoservicethief_ubuntu_os.pdf
    • https://cdn.shopify.com/s/files/1/0429/2653/8911/files/benign_prostatic_hyperplasia_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0429/0212/6755/files/96022794747.pdf
    • https://cdn.shopify.com/s/files/1/0441/2289/8584/files/architectural_design_magazine.pdf
    • https://cdn.shopify.com/s/files/1/0428/3518/1724/files/11859941913.pdf
    • https://cdn.shopify.com/s/files/1/0438/8965/5960/files/zamadosatipowiviza.pdf
    • https://cdn.shopify.com/s/files/1/0430/5757/8137/files/mewakojowozoxenevu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/11178793071.pdf
    • https://cdn.shopify.com/s/files/1/0432/5769/2320/files/58669831862.pdf
    • https://cdn.shopify.com/s/files/1/0445/3348/1636/files/definition_of_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0437/3141/9287/files/25478378613.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_off00008b56.bin
be6249306814490e03dcfe260808985524505f2ae47c9f47dde7e78b73380b72
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B56 5412 bytes
font_01_sfnt_off00009d7f.bin
0d2e8d91b1381e617d2d9934f4af314f523285bf7cf4e12c22db835df73842d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D7F 10024 bytes