Malicious PDF — malware analysis report

Static analysis result for SHA-256 029d52cd2040a5ca…

MALICIOUS

PDF

42.1 KB Created: 2020-10-07 12:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e3dcdcd7928c33681eb5f04068085dc9 SHA-1: 84be9efe87e63c008ac6d48f0ec8c230d171136b SHA-256: 029d52cd2040a5ca2a05c46bd7aa99e2fa2fd5ed157193e05234ec32d105baea
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 one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL for the redirector and several other URLs pointing to Shopify-hosted PDFs, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL points towards an attempt to lead the user to malicious 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://gettraff.ru/strik?keyword=superhero+nutrition+steve+zim+reddit In PDF document text
    • http://files.steindoodles.com/uploads/1/3/1/4/131453718/dbd9ada6.pdfIn PDF document text
    • http://lonuwuxa.biodigitalarchitecture.com/uploads/1/3/0/8/130814448/mefakopowoletid.pdfIn PDF document text
    • http://files.mrsberthaosclassroom.com/uploads/1/3/0/7/130740264/d3b77554683.pdfIn PDF document text
    • http://zosunopan.mardenridingclub.co.uk/uploads/1/3/0/7/130740537/20149.pdfIn PDF document text
    • http://musexi.designedacoustics.com/uploads/1/3/1/3/131379803/rifikademusa-garobu.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/1/0435/3553/2200/files/craftsman_table_saw_parts_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5517/8150/files/80145900717.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6728/5410/files/kejukonariropibu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0305/9110/files/zogemizupikivibetadas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8624/4757/files/18_kilograms_to_ounces_to_pounds.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/5850/0262/files/the_sunless_citadel.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_off00006781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6781 5172 bytes
SHA-256: 3a2e5e64057ebe1e0a402ab0e615367c22aa543f7bcafdc7249a66b38e4ff6c9
font_01_sfnt_off000078fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78FA 10240 bytes
SHA-256: d8926f6833ff492b5e7aefe7a99158f7a5afd6e798875dd2b5eb66eb8c8aafd4

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