Malicious PDF — malware analysis report

Static analysis result for SHA-256 94391a0947ba08da…

MALICIOUS

PDF

52.0 KB Created: 2020-08-14 13:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f41c580ed20282645ab29470a6ddbc81 SHA-1: 50a5ce1534274f701f1a98595fda4bf8d57c029c SHA-256: 94391a0947ba08da714bb473edf52a33bc7d49122212010622b1f7536482ca2d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, including one to a known malicious redirector at ttraff.com. The document body text is heavily obfuscated and appears to be a mix of legitimate-looking content and binary data, likely to evade detection. The primary function appears to be redirecting users to external content, potentially malicious, through a link farm strategy.

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=toronto+accessible+design+guidelines
    • http://files.nancerealtyservices.com/uploads/1/3/1/4/131453260/zomapevuxop-pavakep-moxabuzokipedig-wapokir.pdf
    • http://dupadaz.eastbrooklynbid.com/uploads/1/3/1/6/131637036/6323862.pdf
    • http://files.mackidz.net/uploads/1/3/2/6/132682290/dipemekawilakixabi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nubizasijimowedemo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1144/8729/files/67218557636.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3695/files/dissection_of_cockroach_digestive_system.pdf
    • https://cdn.shopify.com/s/files/1/0438/9847/0552/files/bewafogu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3443/4969/files/nulajafibepijovudujop.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/anomalous_secondary_growth_in_boerhaavia_stem.pdf
    • https://cdn.shopify.com/s/files/1/0434/4601/0022/files/50061581292.pdf
    • https://cdn.shopify.com/s/files/1/0432/2131/9837/files/zezufidoleko.pdf
    • https://cdn.shopify.com/s/files/1/0434/0432/9125/files/mefoteweze.pdf
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/55849098303.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_off00008c6b.bin
72e4370aaa4a85ca9d3024a0961b7a8cf0073bbd8aea675797a897c24089d3d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C6B 5196 bytes
font_01_sfnt_off00009e12.bin
a86ee001b8ac070e2598d87187618d49d869ac2e7f5bcdf6e9367b1c5462125b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E12 10916 bytes