Malicious PDF — malware analysis report

Static analysis result for SHA-256 536a436f53a7ab22…

MALICIOUS

PDF

36.2 KB Created: 2020-08-15 01:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d101e741b3ca69bc116ba4fe0f0aea3a SHA-1: fb4dbef46e7d6f232a9398b303b2f22ea6cc6a44 SHA-256: 536a436f53a7ab22d91dd5b463d074413bb4942201d3765d7784192089100377
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify domains hosting PDF files, which is indicative of a link farm designed to manipulate search engine results. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely the ultimate destination. The document body, though heavily obfuscated, contains the lure text 'Free chutes and ladders template' and the malicious URL, suggesting a social engineering attempt to drive traffic to malicious infrastructure.

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/pify?keyword=free+chutes+and+ladders+template
    • http://tamuv.missionsenegal.com/uploads/1/3/2/7/132741334/8706233.pdf
    • http://files.this-be.com/uploads/1/3/0/8/130874416/xedamega.pdf
    • http://files.paulforattleboro.com/uploads/1/3/0/9/130969545/4651321.pdf
    • http://fobiva.firstassemblybristol.org/uploads/1/3/0/7/130775052/dewabufasumadegazawe.pdf
    • http://files.aquafuelresearch.com/uploads/1/3/1/4/131407965/1849415.pdf
    • https://cdn.shopify.com/s/files/1/0431/4585/5137/files/maras.pdf
    • https://cdn.shopify.com/s/files/1/0438/2782/2749/files/arioso_bach_violin.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9475/files/duxivirilezukivoxux.pdf
    • https://cdn.shopify.com/s/files/1/0432/8855/9780/files/mufavusetizu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/first_in_math_home_page.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7291/files/22428967575.pdf
    • https://cdn.shopify.com/s/files/1/0437/4816/3735/files/4216979324.pdf
    • https://cdn.shopify.com/s/files/1/0433/5150/7112/files/zepekerijarizono.pdf
    • https://cdn.shopify.com/s/files/1/0428/6083/9079/files/70600077132.pdf
    • https://cdn.shopify.com/s/files/1/0439/1947/4856/files/ejercicios_de_enlaces_ionicos.pdf
    • https://cdn.shopify.com/s/files/1/0433/6487/6453/files/zunodazexuxegiwutonit.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_off00005007.bin
6af704d1f1a9ba7b4c22b2da3c17e9d35f367d4b631dcb377d8634fc21d278e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5007 5268 bytes
font_01_sfnt_off000061c0.bin
62eef2330e7bb7cf531ded9cb184d00255bf11130caaca69271b3460c3d8b16a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61C0 10024 bytes

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