Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eee3e99004ed73e…

MALICIOUS

PDF

42.7 KB Created: 2020-08-05 15:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c00bd67db5160e5fa4cd7a9c22bea6f SHA-1: 47e434cea7318b0c91c85bcaefa8d5600dc05e6f SHA-256: 9eee3e99004ed73e8dc23cab938bf05b33e4b13105da6e962f4628780b918839
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains numerous embedded links. One of these links, https://ttraff.ru/pify?keyword=emotional+development+in+preschoolers+pdf, points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of a large number of external PDF links indicates a link farm strategy, likely to improve search engine ranking for malicious content or to distribute further payloads.

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=emotional+development+in+preschoolers+pdf
    • http://files.convictedmerch.com/uploads/1/3/0/8/130813644/rimapudizudi.pdf
    • http://files.nancymontoyareports.com/uploads/1/3/1/4/131454620/jivewuvu.pdf
    • http://files.meaganhesham.ca/uploads/1/3/0/9/130969218/4591974.pdf
    • http://files.allseasonscreenrooms.com/uploads/1/3/2/8/132815318/daxitomojo-fekupizo.pdf
    • http://files.tarabooth.com/uploads/1/3/2/8/132815791/zefawova.pdf
    • https://cdn.shopify.com/s/files/1/0430/3673/7699/files/41337977819.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mofofuledezenededur.pdf
    • https://cdn.shopify.com/s/files/1/0431/1675/7153/files/wefalogugi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/poxabuwewogifejujiwez.pdf
    • https://cdn.shopify.com/s/files/1/0437/5291/5098/files/xorujotivizuzulinosus.pdf
    • https://cdn.shopify.com/s/files/1/0447/9008/7829/files/accounting_tools_for_business_decision_making.pdf
    • https://cdn.shopify.com/s/files/1/0429/2693/2124/files/94387180359.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/74832969368.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/11004951140.pdf
    • https://cdn.shopify.com/s/files/1/0428/9354/1535/files/siditinonivi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8273/5006/files/calligraphy_brush_photoshop.pdf
    • https://cdn.shopify.com/s/files/1/0432/8783/8886/files/dedezu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2328/6940/files/vesuxawipewiside.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_off0000684d.bin
df398723af4c3ea81114f3a7cceef078185a9f61d8278faef4472997e21ece60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x684D 5412 bytes
font_01_sfnt_off00007a90.bin
cfaf341b6e8c2330877aaf7b5d19b8485f58061b30f4d0ebe17f54361ef890d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A90 10360 bytes

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