Malicious PDF — malware analysis report

Static analysis result for SHA-256 335b22627fee3e01…

MALICIOUS

PDF

47.7 KB Created: 2020-08-11 14:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de4974d17e5fedb4c4262045f2ba2366 SHA-1: eeec5ee895710d57c3834e3bea15f879c3e4608d SHA-256: 335b22627fee3e013ffb885c88f677674f58450042631b6fa60fbc5e7e8ded3a
152 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 pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. This suggests a link farm or SEO poisoning attack designed to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be the malicious redirection.

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=esl+pronunciation+practice+pdf
    • http://files.townofolathe.org/uploads/1/3/1/4/131483097/4ab18f5aa88e1.pdf
    • http://fodetafe.dfwiscebs.org/uploads/1/3/0/7/130738568/fba9b559a8731.pdf
    • http://files.laughingbuckfarm.com/uploads/1/3/1/4/131438002/surenu.pdf
    • http://files.businessmanagementorganizer.com/uploads/1/3/0/7/130740127/57d8c.pdf
    • https://cdn.shopify.com/s/files/1/0429/1664/2975/files/how_to_create_a_makefile.pdf
    • https://cdn.shopify.com/s/files/1/0439/3258/2056/files/nafedupirinugezuwogokev.pdf
    • https://cdn.shopify.com/s/files/1/0433/9915/1768/files/guia_de_alimentacion_para_diabeticos.pdf
    • https://cdn.shopify.com/s/files/1/0427/4028/5607/files/83126331251.pdf
    • https://cdn.shopify.com/s/files/1/0432/6542/5570/files/jadusunixiset.pdf
    • https://cdn.shopify.com/s/files/1/0433/8669/9925/files/computer_arch.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4464/files/tivugus.pdf
    • https://cdn.shopify.com/s/files/1/0430/1779/7785/files/wenupoduraro.pdf
    • https://cdn.shopify.com/s/files/1/0434/4456/8216/files/puxesoronupi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7569/7830/files/academic_writing_skills_2.pdf
    • https://cdn.shopify.com/s/files/1/0437/5946/8701/files/69179816444.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bb5.bin
06a9266efec998f21103f8c55b4360a9dbffa3e62e1332608945dda6d041e7c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB5 3292 bytes
font_01_sfnt_off0000779e.bin
efa03c1ea7afab29d2a124e88a7aa3ed27058f54ef7d552d841ba548458ed5d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x779E 5108 bytes
font_02_sfnt_off0000890d.bin
4da3a6b066b622f0350a281bda32727258a96f8e28a81fa9d9523d812bfc4064		 pdf-font-stream PDF embedded font (sfnt) at offset 0x890D 12064 bytes

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