Malicious PDF — malware analysis report

Static analysis result for SHA-256 db02fab567fc8e0c…

MALICIOUS

PDF

48.2 KB Created: 2020-08-06 20:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eacb5bb7f5823cb0484d89f8fc27d6f4 SHA-1: bf47e48b7c3e03d197766565d9908fd11ad6864d SHA-256: db02fab567fc8e0c45551898dd2d6a394d98639d5b4bea7fb2a749fae2490c7f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic firing indicates a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=audio+visual+aids+in+health+education+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect users to malicious sites. No scripts were extracted, and the document body itself does not contain a clear narrative, relying on the link farm for its malicious payload delivery.

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=audio+visual+aids+in+health+education+pdf
    • http://zajavi.susannaabeldesign.com/uploads/1/3/2/7/132712615/durapogukuzinunuboz.pdf
    • http://files.enzopizarrodesigns.com/uploads/1/3/2/6/132695491/2702735.pdf
    • http://demaze.ogphotography1.com/uploads/1/3/0/7/130776031/tomikegufe.pdf
    • http://files.universitywomenofbgsu.com/uploads/1/3/2/6/132695190/3515348.pdf
    • http://files.ipswichgaragedoors.com/uploads/1/3/0/7/130739919/munusidoxabasegugan.pdf
    • https://cdn.shopify.com/s/files/1/0432/9917/6612/files/wimoludipenobi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1928/0288/files/37565101508.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/kitorupimobom.pdf
    • https://cdn.shopify.com/s/files/1/0429/9581/0455/files/burazifikosiz.pdf
    • https://cdn.shopify.com/s/files/1/0447/3788/8410/files/cambridge_latin_course_unit_1_stage_tests.pdf
    • https://cdn.shopify.com/s/files/1/0430/7124/2389/files/kiwazimipitode.pdf
    • https://cdn.shopify.com/s/files/1/0431/9949/6351/files/79575489672.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5093/files/98371732366.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0078/files/98055616067.pdf
    • https://cdn.shopify.com/s/files/1/0434/4214/3388/files/58029078866.pdf
    • https://cdn.shopify.com/s/files/1/0432/9281/9616/files/zipefekugegupafitexup.pdf
    • https://cdn.shopify.com/s/files/1/0430/5561/2058/files/sims_3_mansion.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3627/files/appropriate_preposition_list_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/3391/1705/files/donitonabobesozaxazuv.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_off00007f84.bin
0abd682b6c7cc98400b8f9d67e8f40ef4ac6cfba9460892f2731989e5706925d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F84 5196 bytes
font_01_sfnt_off0000913b.bin
873c081102e346e98d74f0a89cc2f709b3fa78de533c4b22ae6878ea29bf5945		 pdf-font-stream PDF embedded font (sfnt) at offset 0x913B 9888 bytes

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