Malicious PDF — malware analysis report

Static analysis result for SHA-256 2213bf7993f07a6b…

MALICIOUS

PDF

45.6 KB Created: 2020-10-31 09:02:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1de71362daffd71b42931d4d572c496c SHA-1: 2fda16fd4dad90efb864a1293fc66a0384e55242 SHA-256: 2213bf7993f07a6beff614a7c61b2367c873a4b2dabb7872bb15a57bb61a1e3b
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to drive traffic to potentially malicious sites. The ML classifier also strongly indicated maliciousness.

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://gettraff.ru/strik?keyword=honeywell+thermostat+th5110d1022+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366395/normal_5f8c7264b19c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/subud/preoperational_stage_piaget.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6676/9058/files/writing_a_formal_letter_worksheet_ks2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/7281/8845/files/55313589149.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/1441/2190/files/sadibavemuwujoniregalubu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6714/5879/files/types_of_car_racing_in_india.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6520/3093/files/house_of_the_temple.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/6834/6534/files/lutowedilovufotamegege.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/2527/5293/files/53284386783.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/punjab_state_baisakhi_bumper_2019_result_list.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/27171867312.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1263/4816/files/standard_dishwasher_size_in_mm.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000721d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x721D 5668 bytes
SHA-256: 14e44857ee4e16c86af13152169858b4e0f0fa67897213b93dd54212210155af
font_01_sfnt_off00008554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8554 10564 bytes
SHA-256: 0ecdc02c1ff092996a35296e288ec132de3ae26da03d4f472a63073d6bdbd56d

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