Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2367350b57dffbe…

MALICIOUS

PDF

34.0 KB Created: 2020-08-12 18:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b5661a5946ad61b0a59096901f8b2d0 SHA-1: adcb7caf85eb46349f9278c0ec270ba4cf251fbc SHA-256: f2367350b57dffbe58395a9273abc27a63f38abc32234d78a8ae0e0967718c39
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, includes the URL 'https://ttraff.ru/wb?keyword=pulverizador%20manual%205%20litros%20mercado%20libre', suggesting a lure for users searching for products. Additionally, a large number of links to Shopify-hosted PDFs were found, indicating a potential SEO poisoning or link farm tactic. The ML classifier strongly flagged this PDF as malicious.

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/wb?keyword=pulverizador%20manual%205%20litros%20mercado%20libre
    • http://files.btigauges.com/uploads/1/3/0/7/130776001/cdcabed98.pdf
    • http://files.chandao.co.uk/uploads/1/3/1/8/131872055/426918.pdf
    • http://files.westernanimalresources.org/uploads/1/3/1/4/131409794/juwasiso_nuvusexikimota.pdf
    • http://files.utopianetworkofficials.org/uploads/1/3/1/4/131407952/1584114.pdf
    • https://cdn.shopify.com/s/files/1/0440/0565/4678/files/gegemixirelevaroruvupemoz.pdf
    • https://cdn.shopify.com/s/files/1/0438/4351/8614/files/landscaping_plants_pictures_and_names.pdf
    • https://cdn.shopify.com/s/files/1/0434/7101/2006/files/necromancer_5e_enemy.pdf
    • https://cdn.shopify.com/s/files/1/0437/2630/7480/files/bank_english_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/0047/1456/files/35719256784.pdf
    • https://cdn.shopify.com/s/files/1/0428/5195/8947/files/61082099397.pdf
    • https://cdn.shopify.com/s/files/1/0453/5307/4843/files/brian_tracy_time_management_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/1198/0964/files/75611972174.pdf
    • https://cdn.shopify.com/s/files/1/0429/5327/7603/files/wugigom.pdf
    • https://cdn.shopify.com/s/files/1/0438/9378/4728/files/learning_disabilities_definition.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3270/files/48685842894.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/new_headway_english_course_elementary_teacher_s_book.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_off00004694.bin
3fd639b8a4b3349ff73d664ef903c2574cf8ff64f0c0ea7daa1f658c2a2e37c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4694 5460 bytes
font_01_sfnt_off0000591a.bin
a5bc922b459d53c619eff019d58334771b3e54ff0a3e16cc555d055992e6844b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x591A 10492 bytes

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