Malicious PDF — malware analysis report

Static analysis result for SHA-256 88800506d7e29421…

MALICIOUS

PDF

43.2 KB Created: 2020-08-08 03:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7f8137e1c7f3c8c17edadc811008fc7 SHA-1: e5bed4e8265a2d0c742bf622d4e0fc5ac1b9e6c2 SHA-256: 88800506d7e294219cd7d281f2600053e033f152854cb3f6c4b293d6730f337f
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious infrastructure. This indicates a link farm used to obscure the true malicious destination. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic, suggesting a lure related to 'accounting manager job description'. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=accounting+manager+job+description+pdf
    • http://pefemujo.storytellerskgregory.com/uploads/1/3/1/3/131398020/kitiwutagaveve.pdf
    • http://files.alpharettapoliceexplorers.com/uploads/1/3/1/3/131379530/09cc9898acce.pdf
    • http://files.aaronsspeedshop.com/uploads/1/3/1/3/131398598/306004ccb34fbcc.pdf
    • http://files.aspenrugco.com/uploads/1/3/1/8/131856844/vagebewajadapodidu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1241/3847/files/aristocracy_form_of_government.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7238/files/sphax_tekkit_legends.pdf
    • https://cdn.shopify.com/s/files/1/0432/7348/6496/files/20201266017.pdf
    • https://cdn.shopify.com/s/files/1/0431/5978/1538/files/xunabirusotoripolatag.pdf
    • https://cdn.shopify.com/s/files/1/0434/6223/0181/files/aggregate_planning_and_master_production_scheduling.pdf
    • https://cdn.shopify.com/s/files/1/0436/1460/1378/files/61735280405.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/9990140563.pdf
    • https://cdn.shopify.com/s/files/1/0432/0237/9939/files/vapuruwexi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5797/1354/files/43287829358.pdf
    • https://cdn.shopify.com/s/files/1/0434/0583/6444/files/reeds_vol_4_naval_architecture_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27621352833.pdf
    • https://cdn.shopify.com/s/files/1/0444/4468/0359/files/properties_of_white_noise.pdf
    • https://cdn.shopify.com/s/files/1/0427/4877/2508/files/bradford_assay_protocol.pdf
    • https://cdn.shopify.com/s/files/1/0429/9050/2042/files/23631936516.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_off000069b9.bin
5e3f41adeb87ed7cea38041a4180258bc13bdf305878cacb2f5340f3e2a61322
pdf-font-stream PDF embedded font (sfnt) at offset 0x69B9 5648 bytes
font_01_sfnt_off00007cdc.bin
a9d26157e60492efa903482ae03e5c427a327e97ce5d560075166cd58068101f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CDC 10112 bytes