Malicious PDF — malware analysis report

Static analysis result for SHA-256 e69fbac35c3d4e90…

MALICIOUS

PDF

37.6 KB Created: 2020-08-18 21:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27291f111c17b242af3e4fdf1faef038 SHA-1: 3c63bf07178912757e852ceac0c3a552e8586ed6 SHA-256: e69fbac35c3d4e905654acf126a19c191d8c3ba03175b20a663edfb468c22b49
154 Risk Score

Malware Insights

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

The PDF document contains a significant number of embedded links, with the primary link pointing to a known malicious redirector. The heuristic firings indicate this is a malicious redirector link and a PDF link farm, suggesting the document's purpose is to lure users to malicious sites. The ML classifier also strongly flagged this PDF as malicious. 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.com/pify?keyword=boney+m+christmas+songs+sheet+music
    • http://files.nejoudalyagout.com/uploads/1/3/0/7/130775462/natekakepasugaxoworo.pdf
    • http://zabez.linguamusicatours.com/uploads/1/3/1/8/131871825/4052821.pdf
    • http://files.futures-in-motion.com/uploads/1/3/2/8/132815342/bugog.pdf
    • http://setikafob.tabithareyes.com/uploads/1/3/1/4/131453133/8860911.pdf
    • https://cdn.shopify.com/s/files/1/0437/9125/3653/files/kiwamurasujaxivowonak.pdf
    • https://cdn.shopify.com/s/files/1/0431/6567/9776/files/xukimuxow.pdf
    • https://cdn.shopify.com/s/files/1/0434/0049/5260/files/5330173302.pdf
    • https://cdn.shopify.com/s/files/1/0439/1524/7771/files/career_path_finance.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wunize.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/28068876324.pdf
    • https://cdn.shopify.com/s/files/1/0434/9784/8996/files/zekerorodudikerifife.pdf
    • https://cdn.shopify.com/s/files/1/0433/6353/2951/files/nivenavuselesodepizati.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_off00005582.bin
8035779de7fddb6359d9e15cb4617fe6252fdcde8c842a357e223cb206630e24
pdf-font-stream PDF embedded font (sfnt) at offset 0x5582 5332 bytes
font_01_sfnt_off00006779.bin
f9dbe7fe5d7b3c0826ec2fb537b4b0e211c7e3322639ab637e990098c4a8e163
pdf-font-stream PDF embedded font (sfnt) at offset 0x6779 9948 bytes