Malicious PDF — malware analysis report

Static analysis result for SHA-256 00b884e6b9f0d096…

MALICIOUS

PDF

56.5 KB Created: 2020-08-26 09:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f2394b6c40d8aeb86b56534f6ece04c SHA-1: bfe43d479a1f7d4358cbfc507a3e46d7b54c3eeb SHA-256: 00b884e6b9f0d096cbc926c3b6020e21db3e39d15c2b8bfaaf3d6f89e24d0582
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 Shopify domains that appear to host benign content. However, one critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=affective+filter+hypothesis'. The document body, though heavily obfuscated, contains this same URL, suggesting the primary purpose is to redirect users to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=affective+filter+hypothesis
    • http://gewuleze.salsaritaslexky.com/uploads/1/3/2/6/132682467/336eaed.pdf
    • http://zarosa.dancaffreywrites.com/uploads/1/3/0/7/130775052/guniseg_bevupet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5187/5481/files/pathogenesis_of_stroke.pdf
    • https://cdn.shopify.com/s/files/1/0434/7474/7545/files/catecismo_menor_de_westminster_comentado.pdf
    • https://cdn.shopify.com/s/files/1/0437/8070/2366/files/80392071974.pdf
    • https://cdn.shopify.com/s/files/1/0437/0631/9002/files/48583695767.pdf
    • https://cdn.shopify.com/s/files/1/0462/5730/7797/files/total_coliform_sampling_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0427/8606/2495/files/53629021469.pdf
    • https://cdn.shopify.com/s/files/1/0435/1524/8794/files/bayside_state_prison_visiting_information.pdf
    • https://cdn.shopify.com/s/files/1/0430/6544/2457/files/muziwufekewigejom.pdf
    • https://cdn.shopify.com/s/files/1/0428/8138/4604/files/icloud_unlocker_software.pdf
    • https://cdn.shopify.com/s/files/1/0431/7049/6672/files/gimirixotobakedejeboluri.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000089ea.bin
adfba847967ed3b25b30c1046e535d0e09eb5e35526d73b5a2e97f7f36258dfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89EA 5044 bytes
font_01_sfnt_off00009b17.bin
1272a0560e55d030da6728edaa1cb1a2aeac92b40a095adbe96240913662d268		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B17 10404 bytes
font_02_sfnt_off0000bed0.bin
e062faff0b5f3d12ef96d17a813e209689a07cec8984531399442ab350abe39b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBED0 16136 bytes

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