Malicious PDF — malware analysis report

Static analysis result for SHA-256 884a5850c073b114…

MALICIOUS

PDF

37.3 KB Created: 2020-09-17 06:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fa8b84f5acbcdd87a4eba92264b94d1 SHA-1: 5398ffef13ee75c416ce9f16a89da16418e1ce89 SHA-256: 884a5850c073b1140d2c538fd1365ed20a2b50398dcf468252ce243122c63dca
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to suspicious domains and are flagged as part of a link farm. One critical heuristic identified a link to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that mirrors the suspicious redirector link, suggesting the primary purpose is to redirect users to malicious content. No scripts were extracted from this sample.

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.link/wix?keyword=krane+modern+physics+4th+edition+pdf
    • http://files.bloomingtonbirthdoula.com/uploads/1/3/0/7/130775023/zomawebejitik.pdf
    • http://files.fldvipn.com/uploads/1/3/1/3/131398008/boxiwisupipufuletus.pdf
    • http://tavanarix.kpcecala.net/uploads/1/3/1/3/131383770/kitafituvozowusale.pdf
    • http://bulonodo.chicagotrainingcenter.org/uploads/1/3/1/8/131856772/vowedagedemor.pdf
    • http://kijilup.lesleyrosochodski.com.au/uploads/1/3/1/0/131071117/b71471a6.pdf
    • http://files.jhillpropertymanagementllc.com/uploads/1/3/1/4/131407315/dulidazi.pdf
    • http://duwew.mtolivetofperry.org/uploads/1/3/0/8/130874150/noborupibewader.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1542/files/1674430799.pdf
    • https://cdn.shopify.com/s/files/1/0431/7996/6628/files/24011479658.pdf
    • https://cdn.shopify.com/s/files/1/0428/1974/7996/files/nefagiwila.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/niwawave.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_off0000539a.bin
4b789085b1ea20ceb26f980c72b5fcdcea5a13d02b81c6dbb487c276fa232919		 pdf-font-stream PDF embedded font (sfnt) at offset 0x539A 5520 bytes
font_01_sfnt_off00006650.bin
540bda995ac63d2726481b56ba87b32d67c8a86337246bab97eefd6acd416a4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6650 10184 bytes

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