Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21853c33e85a6c3…

MALICIOUS

PDF

119.2 KB Created: 2020-08-10 23:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e175f64b115fe012d3775c45c26bad9f SHA-1: a34a6ce85211b7c7b35cdccab5df7d77389cb5d8 SHA-256: b21853c33e85a6c3ec9e54407f4424e4205bffab1b927410e85cae342cd2b774
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector (ttraff.com). The document body, though heavily obfuscated, contains text related to the periodic table and the wkhtmltopdf tool, suggesting a lure. The presence of numerous external links, including to Shopify domains, indicates a potential SEO poisoning or link farm strategy to distribute malicious content. 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.com/pify?keyword=historia+de+la+tabla+periodica+de+los+elementos+pdf
    • http://files.emmafisk.co.uk/uploads/1/3/0/7/130775831/8315811.pdf
    • http://files.glowingmermaids.com/uploads/1/3/0/7/130775987/renatuvajewomem_daxupogupagudek_xajame.pdf
    • http://files.francoisharray.com/uploads/1/3/2/7/132740779/5692007.pdf
    • http://files.myfullcirclefarms.com/uploads/1/3/1/3/131383480/begekoda.pdf
    • http://files.amyspeechlanguagetherapy.com/uploads/1/3/0/8/130813899/javinomulogojaxeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/57308776079.pdf
    • https://cdn.shopify.com/s/files/1/0428/7420/8415/files/fusezalajavixof.pdf
    • https://cdn.shopify.com/s/files/1/0439/1947/4856/files/muwotevelimejemanu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/english_language_evaluation_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/6033/8586/files/lokivomoxot.pdf
    • https://cdn.shopify.com/s/files/1/0431/6551/5933/files/71863044665.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/banefidofekadozimodomi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6953/7432/files/nokupodixivu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vazakiliduvapi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/livre_techniques_d_amlioration_continue_en_production.pdf
    • https://cdn.shopify.com/s/files/1/0434/6000/1957/files/69985203875.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9797/files/23084243428.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_off0001939f.bin
233e81f832a34249466d35495d96357580801b7eb2e05937aa7f93892e4267c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1939F 5404 bytes
font_01_sfnt_off0001a5d9.bin
86e39aaf0854f7e10bd1ed3593183fe223cb90b03b53b7ffd56c508acf3538b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5D9 12040 bytes

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