Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba4d82d69503a3c…

MALICIOUS

PDF

40.7 KB Created: 2020-08-18 17:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32345e7c24acb410d9109bd2b2cbe234 SHA-1: f217c35f09c9d86f2782007d2a3988bd490d2d67 SHA-256: fba4d82d69503a3ceda04e1082634aaea31346c61f5e3ea79a5e8b76a201faf3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many hosted on Shopify. The document body, though heavily obfuscated, contains the same redirector URL and a Shopify URL, suggesting these are the intended destinations. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be luring the user to malicious infrastructure via embedded links.

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=centralised+management+information+system
    • http://vuduz.cizellelouw.com/uploads/1/3/2/7/132712207/jivulelumaguse_gaguxaxazizatut_nowasi.pdf
    • http://viwaje.theowlfrompowell.com/uploads/1/3/0/7/130775364/1414176.pdf
    • http://files.centre5pinbowl.ca/uploads/1/3/1/4/131453198/4847870.pdf
    • https://cdn.shopify.com/s/files/1/0448/4084/5469/files/29900189815.pdf
    • https://cdn.shopify.com/s/files/1/0435/9441/6290/files/84280335892.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/anet_a8_3d_printer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/9413/8277/files/vifekor.pdf
    • https://cdn.shopify.com/s/files/1/0435/6312/2843/files/dupifiketaresofax.pdf
    • https://cdn.shopify.com/s/files/1/0427/8370/3206/files/vadiz.pdf
    • https://cdn.shopify.com/s/files/1/0435/8648/6440/files/6028951860.pdf
    • https://cdn.shopify.com/s/files/1/0429/2670/2755/files/81271931203.pdf
    • https://cdn.shopify.com/s/files/1/0436/9167/1705/files/5371410794.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rinavupomun.pdf
    • https://cdn.shopify.com/s/files/1/0439/5224/2856/files/2253767135.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_off000061bc.bin
e1d3a54ad30b9cf20bbec2aaaf977003cb2f3e540f9480481032a43c22acb3b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x61BC 5236 bytes
font_01_sfnt_off00007373.bin
80dc4aa274da14f8477495a47fa8a50771bcc33e801b55d34fca0db2f568ab41
pdf-font-stream PDF embedded font (sfnt) at offset 0x7373 10040 bytes