Malicious PDF — malware analysis report

Static analysis result for SHA-256 df613a102ef32586…

MALICIOUS

PDF

48.5 KB Created: 2020-08-10 16:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0877e7e70b4be0c39465078260d895f7 SHA-1: 36acc8e6dd987aeaa72cf4e4baa3c8f467896bb8 SHA-256: df613a102ef3258694091caf1063bbeb8773428f7280120d2cba863a0c27e2e1
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 various domains. One critical heuristic firing indicates that a link within the document redirects to known malicious infrastructure at 'ttraff.com'. The document body text, though partially corrupted, includes the same URL, suggesting an attempt to lure the user to a malicious site. The ML classifier also strongly flagged this PDF as malicious.

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=focal+length+of+concave+mirror+experiment+pdf
    • http://files.cottageshack.com/uploads/1/3/1/3/131378950/040fc.pdf
    • http://files.knightsaccountancysolutions.co.uk/uploads/1/3/1/4/131453725/nolikonowogitot_puvakelamabad_jezatusedef_wimadibak.pdf
    • http://files.firehawkllc.com/uploads/1/3/1/8/131871852/rezigo-xazonadew-mubix.pdf
    • https://cdn.shopify.com/s/files/1/0427/9874/3719/files/fotobawi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0700/7141/files/behaviorism_and_cognitivism.pdf
    • https://cdn.shopify.com/s/files/1/0428/9432/7961/files/45848826752.pdf
    • https://cdn.shopify.com/s/files/1/0434/1720/6946/files/wosel.pdf
    • https://cdn.shopify.com/s/files/1/0432/8321/8600/files/algebra_2_common_core_curriculum_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0427/7973/8278/files/wowajajowuwa.pdf
    • https://cdn.shopify.com/s/files/1/0435/1574/0312/files/jodimejujimik.pdf
    • https://cdn.shopify.com/s/files/1/0434/4902/4669/files/python_xml_parser.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/3074450321.pdf
    • https://cdn.shopify.com/s/files/1/0434/8936/2082/files/45308775374.pdf
    • https://cdn.shopify.com/s/files/1/0431/4130/0380/files/brown_bear_brown_bear_activities.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23281911610.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0058/files/pathophysiology_of_huntington_s_disease.pdf
    • https://cdn.shopify.com/s/files/1/0432/6536/0034/files/sebogilukuzerebuwapaxola.pdf
    • https://cdn.shopify.com/s/files/1/0432/4940/2024/files/gefevesapepepibora.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_off00007ebb.bin
4e5d5644c138f4f7115db35af1434c86bc07cb63b8055650a1a4496274986cf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EBB 5476 bytes
font_01_sfnt_off00009134.bin
cb1a1872f66863c01eca165c08af301f545916d4ab523ba3a335987a7c4d3d27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9134 10524 bytes

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