Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cdb1af7586356f2…

MALICIOUS

PDF

50.3 KB Created: 2020-07-29 02:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e014a58cd79de1585773dae8aa724235 SHA-1: 10b7a79585bda0375c97b86cedc0edd6ed29fa59 SHA-256: 5cdb1af7586356f2254bc088f856a86fa35c0beeeb9625558f3530d7845c6544
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly indicate that the primary purpose of this document is to direct users to malicious websites. The ML classifier also flagged this PDF with high confidence.

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=arthritis+types+pdf
    • http://files.innerframework.org/uploads/1/3/1/4/131453268/0d449b1710b.pdf
    • http://files.bvda.org.uk/uploads/1/3/2/6/132681885/labelejumovetixumit.pdf
    • http://files.monsoonblooms.com/uploads/1/3/0/8/130814680/7741326.pdf
    • http://files.divorcecoachingandconsulting.com/uploads/1/3/0/8/130874518/bejam-soselovorifat-tekumubobup-powidonuvewadar.pdf
    • http://files.latoyaharrisministries.com/uploads/1/3/1/3/131397927/bopoweke.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7694/3000/files/raxobujanulixi.pdf
    • https://cdn.shopify.com/s/files/1/0428/6421/4175/files/jajawuvijezogejuzadezevev.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66083684812.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96280370261.pdf
    • https://cdn.shopify.com/s/files/1/0436/1574/8253/files/78426663886.pdf
    • https://cdn.shopify.com/s/files/1/0429/8699/5863/files/71304305718.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6951/files/japag.pdf
    • https://cdn.shopify.com/s/files/1/0433/0281/3849/files/fubasoropifofujemuda.pdf
    • https://cdn.shopify.com/s/files/1/0435/6997/1363/files/10890509106.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/91201844961.pdf
    • https://cdn.shopify.com/s/files/1/0435/2039/3375/files/kijunigewotalebuwus.pdf
    • https://cdn.shopify.com/s/files/1/0438/3863/6192/files/98671712324.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_off00008942.bin
130b256399e6887062298a3cfba4662a2cfd01218d72dcb923518bacda0d06b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8942 4548 bytes
font_01_sfnt_off000098d3.bin
1ab64ca956fdec36b32925be63b5d57d986991ea20b3f9e3055b4a19aae2254d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98D3 10264 bytes

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