Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d7797410c0f877…

MALICIOUS

PDF

34.9 KB Created: 2020-10-06 22:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b4502fb6b78d405f34aba7d751a88b4d SHA-1: 8440a5bddf306841e45a7a4943c7cc7fab44cd34 SHA-256: 83d7797410c0f877b55ecb004ac3439f16446f9c049b1d813ed9b59d476080e4
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The primary malicious link identified is https://cctraff.ru/strik?keyword=passive+voice+simple+future+exercises, which is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain references to educational content, likely as a lure. No scripts were extracted, but the PDF structure itself facilitates the attack.

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://cctraff.ru/strik?keyword=passive+voice+simple+future+exercises In PDF document text
    • http://vofiximox.givesmilesong.com/uploads/1/3/2/6/132682717/1683635.pdfIn PDF document text
    • http://files.smilingelfsoap.com/uploads/1/3/0/8/130813558/4185107.pdfIn PDF document text
    • http://files.syedarahman.com/uploads/1/3/1/4/131438069/mejupik.pdfIn PDF document text
    • http://files.olqpmd.org/uploads/1/3/1/4/131452740/8360941.pdfIn PDF document text
    • http://files.cbakermath.com/uploads/1/3/0/8/130813643/329540.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9249/8850/files/ralimimimevurotoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2987/4853/files/practica_de_gramatica_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/0847/0423/files/spare_the_rod_spoil_the_child_meaning.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/3052/2267/files/kh_2.5_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7693/5068/files/stars_nycdoe_login.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7406/3002/files/8315021997.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1980/4578/files/girard_tankless_water_heater_door_kit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5407/9904/files/behavior_contract_template_for_teenager.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6455/5680/files/bugler_cigarette_tobacco_review.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8697/6926/files/34811391667.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4782/8133/files/what_were_the_goals_of_the_three_plans_for_reconstruction.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3905/5253/files/68027420800.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9963/4326/files/41415932537.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_off00004b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B19 5292 bytes
SHA-256: 21a26cc0cc830367d0c9b1f5fcc16c979f747b85b16b531fced44538d106cb9f
font_01_sfnt_off00005d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D0C 9760 bytes
SHA-256: 44956ab45f7f97bbc349e9b83e5c4971dc8e7dc0a13cfb1dd368a674de3af7d4

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