Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc265c79c937e08…

MALICIOUS

PDF

41.8 KB Created: 2020-10-01 23:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 409498b44c19eeff00133cccde5ae1ad SHA-1: d976200dd19d69d1c1b1db698c4f257ebdc3d4f0 SHA-256: 3dc265c79c937e08209d4c32504c7d58d65faf71f7991f05ddcfa69c531dcef9
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a search query for an answer key, likely a lure. The presence of numerous links, including those to potentially malicious sites, indicates an attempt to redirect users to harmful content.

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=speak+now+3+workbook+answer+key+pdf In PDF document text
    • http://files.dlsu-aki.com/uploads/1/3/1/4/131438460/puzuv-kedabibuf-rasogaratum-xeneju.pdfIn PDF document text
    • http://files.jenniferwoolcockschwartz.com/uploads/1/3/0/7/130776673/03375bd03.pdfIn PDF document text
    • http://berume.samuelbloch.fr/uploads/1/3/2/8/132814940/8424581.pdfIn PDF document text
    • http://files.dancinggrains.com/uploads/1/3/2/6/132681513/kibolu_sofev_nasunu.pdfIn PDF document text
    • https://site-1036977.mozfiles.com/files/1036977/bapanuwixobugu.pdfIn PDF document text
    • https://site-1036665.mozfiles.com/files/1036665/vijutabenebukunuxega.pdfIn PDF document text
    • https://site-1038971.mozfiles.com/files/1038971/mokibimorerijifez.pdfIn PDF document text
    • https://site-1036816.mozfiles.com/files/1036816/rogidowolorusiletanelod.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/1/0469/4527/1969/files/killing_cave_crawlers_osrs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/3921/0911/files/dmv_registration_van_nuys.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3360/5797/files/48433340179.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9292/9431/files/rv_email_schaden.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1677/4054/files/66896873279.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4392/8726/files/hamlet_act_3_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9068/2783/files/scharffen_berger_chocolate_maker_llc.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_off000063ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63AB 5668 bytes
SHA-256: f2fb19adf1aff653288fe786a62bac46a8349b54ec07725d81e81714adcaae53
font_01_sfnt_off0000771a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x771A 10304 bytes
SHA-256: 4a6688ec1ba853f27fdb44c586589d0dfb4c3d7e718c2594f324c111728f6e09

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