Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d83f0dab97b7e64…

MALICIOUS

PDF

44.5 KB Created: 2020-08-14 19:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96de6d4341577d64469153effa286794 SHA-1: ef319ccaedb23c04d18f1774a5f8ca7a61180f6a SHA-256: 6d83f0dab97b7e641c07cc25bb2b7d9de8d8457272efae4246b94f08147014f8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically to 'ttraff.com'. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to disguise a malicious redirector as an academic worksheet. The ML classifier strongly indicated maliciousness, supporting the presence of a malicious redirector.

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=factoring+quadratics+with+a+leading+coefficient+worksheet
    • http://files.nicole-phillips.com/uploads/1/3/1/6/131637919/zebasinapukomorumudi.pdf
    • http://muvananem.treekintrove.com/uploads/1/3/1/8/131871578/4847290.pdf
    • http://files.nabokovonline.com/uploads/1/3/0/7/130775537/topelif.pdf
    • http://files.jrjcounselling.com/uploads/1/3/1/4/131453198/4847286.pdf
    • http://givemujag.humanities.shenfieldlearning.com/uploads/1/3/0/7/130739678/vapasifetebipet-kukepilegiveb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/55759300014.pdf
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/egypt_map_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/5040/0920/files/84247220837.pdf
    • https://cdn.shopify.com/s/files/1/0438/1078/3394/files/bevisisetiva.pdf
    • https://cdn.shopify.com/s/files/1/0429/3571/3958/files/jizopuxifulepodidego.pdf
    • https://cdn.shopify.com/s/files/1/0433/0238/7867/files/14576710922.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/44082322326.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30547733638.pdf
    • https://cdn.shopify.com/s/files/1/0437/6428/5592/files/59057490135.pdf
    • https://cdn.shopify.com/s/files/1/0435/5050/7167/files/81845605611.pdf
    • https://cdn.shopify.com/s/files/1/0436/4071/7462/files/9680769712.pdf
    • https://cdn.shopify.com/s/files/1/0427/5660/4070/files/237570282.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/miveguxuxububepevomozit.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f3c.bin
c8d6a8572ed5e907d267befb347e6bc294c723cc19b041c05a2aec88bf82a1af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3C 5520 bytes
font_01_sfnt_off00008201.bin
6be4e80fddf82a976ce53503a63db9fa2b4dd33bdc60d8a0facd8608e56c0a0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8201 9972 bytes

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