Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8af66126a4561ee…

MALICIOUS

PDF

45.4 KB Created: 2020-08-29 12:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 334aa7b049fe23451a1aa1ad86cb661c SHA-1: 2496d6ff1f4dc41a07df979773c4a576c8e9db55 SHA-256: e8af66126a4561eece9c93f802970c2c4b0bcd52e0fd10213f3c1f5a82dd5236
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, directing users to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to Shopify domains. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be luring users to a malicious site via a deceptive document title.

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/wix?keyword=break+even+analysis+numerical+questions+and+answers
    • https://cdn.shopify.com/s/files/1/0428/5857/8086/files/worabesubitifelugabowik.pdf
    • https://cdn.shopify.com/s/files/1/0436/7283/0105/files/66630994090.pdf
    • https://cdn.shopify.com/s/files/1/0435/5286/6467/files/staff_performance_appraisal_sample.pdf
    • https://cdn.shopify.com/s/files/1/0431/5168/7848/files/vujuluzogevekufabufesumif.pdf
    • https://cdn.shopify.com/s/files/1/0440/6696/3621/files/mogiloratasupol.pdf
    • https://cdn.shopify.com/s/files/1/0440/2741/2645/files/vugosugokona.pdf
    • https://cdn.shopify.com/s/files/1/0427/8855/2870/files/waxituz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/10412872155.pdf
    • https://cdn.shopify.com/s/files/1/0434/7238/8246/files/68556983024.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0401/files/dezezisogukukamamaxom.pdf
    • https://cdn.shopify.com/s/files/1/0437/6340/0861/files/arm_cortex_m4_cookbook_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6289/4495/files/vodojutedupep.pdf
    • https://cdn.shopify.com/s/files/1/0431/7865/5903/files/simple_tictactoe_java_code.pdf
    • https://cdn.shopify.com/s/files/1/0434/9168/8610/files/67792757915.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/15095910676.pdf
    • https://cdn.shopify.com/s/files/1/0434/8615/0816/files/3184808027.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/
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/10412872155

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fd7.bin
b795295d60804940ed0ebb103360de51569ad38531ad0c7d3d1fded49c5d081f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD7 5580 bytes
font_01_sfnt_off000082cd.bin
649bf97efe2049b3a430ae06d584f8656fc0423ce84cf3f154eff96497e69117		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82CD 10836 bytes

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