Malicious PDF — malware analysis report

Static analysis result for SHA-256 2feb145806bfd57f…

MALICIOUS

PDF

34.0 KB Created: 2020-08-28 00:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 199622e6ba445aab67d30dff01c7ebd2 SHA-1: 084c547d9ddeeffd14fe2332f76312c0a4a5a82a SHA-256: 2feb145806bfd57fe500cf84c1b73e6b6c9d2d408525af1a9dfefb385af7c715
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of these links, 'https://ttraff.com/pify?keyword=realidades+2+chapter+2a+test+answers', is identified as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure under the guise of providing test answers.

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=realidades+2+chapter+2a+test+answers
    • http://sakoso.balanceacu.com/uploads/1/3/1/4/131437532/9378726.pdf
    • http://toxoju.upendo-okat.com/uploads/1/3/1/4/131483453/f35dbc.pdf
    • http://sonipin.crossfitzonedesign.net/uploads/1/3/1/3/131384709/zenonevelir-kopurilidukix-bidexabadire-zuponusewolol.pdf
    • http://benowasi.oasis-ministries.org/uploads/1/3/1/3/131398243/63b1f9e8293f3.pdf
    • http://files.cottondownsouth.com/uploads/1/3/1/4/131437593/68f5e82128.pdf
    • https://cdn.shopify.com/s/files/1/0427/4916/5734/files/vobefora.pdf
    • https://cdn.shopify.com/s/files/1/0435/1649/3976/files/15727931677.pdf
    • https://cdn.shopify.com/s/files/1/0430/9614/6073/files/59104156069.pdf
    • https://cdn.shopify.com/s/files/1/0427/4916/5734/files/11_new_syllabus_tamil_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/3795/7023/files/67114121203.pdf
    • https://cdn.shopify.com/s/files/1/0434/0734/3779/files/33495273543.pdf
    • https://cdn.shopify.com/s/files/1/0429/2893/0979/files/buzulotifoninu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2718/5316/files/puvepumixewi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2479/3245/files/dupawamosasidulapijipavux.pdf
    • https://cdn.shopify.com/s/files/1/0433/7955/6504/files/anterior_guided_growth_appliance.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_off00004749.bin
912cf08b75a273d40d39cc43ea93e6479b39ebd5a3a9125ba8ad00633a3ae9e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x4749 5392 bytes
font_01_sfnt_off000059ab.bin
2ae7034d0864ee3f494f9b70cd886cc793fbbc5dd046203b5338e157bfb9609a
pdf-font-stream PDF embedded font (sfnt) at offset 0x59AB 9820 bytes