Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a1fab492f462ff…

MALICIOUS

PDF

73.4 KB Created: 2020-08-18 22:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0dc083a66e5fefb78b7c435b477003bf SHA-1: fcfbf565c6d997c2735eb9816a33b18e6a8c57c3 SHA-256: 40a1fab492f462ff0cbe5c86c518434980cd8c53fbe7b01a03d380ade54618f6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links, with one specifically identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, pointing to 'https://ttraff.com/pify?keyword=6+below+parents+guide'. The document body, though heavily obfuscated, contains the same redirector URL and text suggesting a lure. The ML classifier also strongly indicated maliciousness.

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=6+below+parents+guide
    • http://files.businessforumfordummies.com/uploads/1/3/1/4/131482975/libukagebenonat.pdf
    • http://files.ksharp1.com/uploads/1/3/1/4/131453206/0563b.pdf
    • http://podel.wildwellnessguide.com/uploads/1/3/0/8/130814328/2775095.pdf
    • http://files.elanamizrahi.com/uploads/1/3/1/6/131606325/kamijenejan.pdf
    • https://cdn.shopify.com/s/files/1/0428/5064/8223/files/23139374328.pdf
    • https://cdn.shopify.com/s/files/1/0436/9140/9558/files/87367059578.pdf
    • https://cdn.shopify.com/s/files/1/0434/6894/7616/files/34310396495.pdf
    • https://cdn.shopify.com/s/files/1/0432/2017/2957/files/wakuzaxabimuvovixotivav.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/files/moral_hazard_and_adverse_selection.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/40989628086.pdf
    • https://cdn.shopify.com/s/files/1/0439/1128/2843/files/gewezekuxujuzogewujux.pdf
    • https://cdn.shopify.com/s/files/1/0432/6414/7609/files/adversus_jovinianum.pdf
    • https://cdn.shopify.com/s/files/1/0431/5650/4744/files/55758727870.pdf
    • https://cdn.shopify.com/s/files/1/0430/4535/5682/files/45215780935.pdf
    • https://cdn.shopify.com/s/files/1/0446/5931/0745/files/runurazadewunox.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_off0000dff1.bin
057b9e563bc512a0548d83fd2218f55e9564cb6ed6d2f9d5c3412e7df5a8f5ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF1 5416 bytes
font_01_sfnt_off0000f26c.bin
33eccb5d417319ea47f3fe6ae34f69545b4907261e64adc14093fbae6ccb8838
pdf-font-stream PDF embedded font (sfnt) at offset 0xF26C 11164 bytes