Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd4f85cdb067545…

MALICIOUS

PDF

63.2 KB Created: 2020-08-06 12:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27fb7562bc44d1c986ff65e4a4fca32d SHA-1: b3e12f4d1873e8cca99478655ad506d7cadbd574 SHA-256: ecd4f85cdb0675454ee7e91d56f1c987be8fa63a79433adcb024a230189af72f
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link to 'ttraff.cc'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of numerous other links to PDF files hosted on various domains indicates a link farm, likely for SEO poisoning or to obscure the malicious redirector. The ML classifier 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.cc/pify?keyword=emotional+intelligence+research+pdf
    • http://vexofopep.voodooandburntrubber.com/uploads/1/3/1/6/131606552/jisope.pdf
    • http://files.sosinsuranceagencies.com/uploads/1/3/0/8/130814529/d2fb19.pdf
    • http://files.wafflehousecatering.com/uploads/1/3/0/9/130969772/fcb18a9d38.pdf
    • http://files.loveadelyn.com/uploads/1/3/0/8/130874066/c00819a.pdf
    • http://files.ambertennant1616.com/uploads/1/3/0/7/130776413/8341147.pdf
    • https://cdn.shopify.com/s/files/1/0435/9235/1907/files/50687395157.pdf
    • https://cdn.shopify.com/s/files/1/0432/0552/5661/files/26270490435.pdf
    • https://cdn.shopify.com/s/files/1/0434/8716/6628/files/94491000963.pdf
    • https://cdn.shopify.com/s/files/1/0432/4343/8244/files/analytical_geometry_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/4071/8496/files/6471576837.pdf
    • https://cdn.shopify.com/s/files/1/0428/9776/8614/files/55163017550.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6010/files/15579616261.pdf
    • https://cdn.shopify.com/s/files/1/0430/9054/2753/files/ratoxewubadimovasiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/2255/7082/files/taxaxonorejitopibod.pdf
    • https://cdn.shopify.com/s/files/1/0432/0781/9422/files/xusuwulixupofekif.pdf
    • https://cdn.shopify.com/s/files/1/0432/1614/2497/files/36957776062.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_off0000b936.bin
90c22d1a37c9ec43413e8f5245a90d448acbbd8f7c0bff4bd9f90723d33297ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xB936 5524 bytes
font_01_sfnt_off0000cbd5.bin
7b6b72b9a9cb82350b97de1aa599b876ed324367dd9d84ad566b7a412c21acd6
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD5 10352 bytes