Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2637137f1afdb81…

MALICIOUS

PDF

41.4 KB Created: 2020-08-15 09:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08acd7a866031c29c32d39cee818c0a1 SHA-1: 31bdeb496888a53335c4f8a639f87777ff63d8fb SHA-256: a2637137f1afdb81b84bc1f9494bc9e12e233ead50fb4f23a4811b727bca9503
128 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.ru. The document body, though heavily obfuscated, contains text related to 'electrostatics formulas for neet pdf' and the malicious URL, suggesting a lure. Additionally, the PDF is flagged as a link farm, with numerous links pointing to Shopify domains, likely to obscure the malicious redirector. The presence of a visual download button further supports the social engineering aspect of this attack.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=electrostatics%20formulas%20for%20neet%20pdf
    • http://files.ravenbeak.com/uploads/1/3/1/3/131380397/2937556.pdf
    • https://cdn.shopify.com/s/files/1/0432/8128/5286/files/ragesawiziwalizuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/7752/4888/files/95714330211.pdf
    • https://cdn.shopify.com/s/files/1/0434/9945/4628/files/valufumopumawetapelile.pdf
    • https://cdn.shopify.com/s/files/1/0434/1488/0405/files/devoluzitid.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/nupeziturigozi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5329/2440/files/hashset_vs_hashmap_vs_hashtable.pdf
    • https://cdn.shopify.com/s/files/1/0440/7522/1142/files/gukovi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8713/4882/files/african_american_a_concise_history.pdf
    • https://cdn.shopify.com/s/files/1/0434/6868/5464/files/88798391388.pdf
    • https://cdn.shopify.com/s/files/1/0431/0745/1029/files/59004955770.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d00.bin
b6d3f3de89807efa229d43ebda26e870c1ab6e79bc30f3b342d08c0fb7313af7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D00 5256 bytes
font_01_sfnt_off00005ec2.bin
87cea97aa5913e382d0b83fe28c01067adcee713251e1160da70d474af739e5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC2 10768 bytes
font_02_sfnt_off000083d5.bin
82e34b6078ab78a77639f03fa93f8081c16dfe9c50b0aec6247833ef8067a7c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83D5 16104 bytes

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