Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f1e8c131799ca0…

MALICIOUS

PDF

37.0 KB Created: 2020-10-01 08:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7eef528770eccd28d685e20c0bd4793f SHA-1: 20be10df171529a2798504e5f843b0b087b80461 SHA-256: b7f1e8c131799ca06333f383c9a81ad610b1aa15d526de1b24eb863f3abe0699
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that mirrors the malicious redirector's target. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO manipulation tactic to distribute malicious content. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

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=acgih+pdf+traduzido In PDF document text
    • http://fusexijat.michaelsmarketingagency.com/uploads/1/3/0/7/130775411/gugikoma.pdfIn PDF document text
    • http://kusufabil.basilicainvestors.com/uploads/1/3/1/4/131483372/36d174e9e316a9.pdfIn PDF document text
    • http://vopifuz.corefitathletics.com/uploads/1/3/1/4/131406893/0aac641bb147f.pdfIn PDF document text
    • https://site-1036832.mozfiles.com/files/1036832/pebitogub.pdfIn PDF document text
    • https://site-1037160.mozfiles.com/files/1037160/zagotilawalaret.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/1/0429/2945/5263/files/34623940676.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7258/5881/files/gunilava.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2468/5975/files/zaxirudus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6512/1699/files/angular_define_function_in_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4449/4750/files/wazufiranumosevimalo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0721/2709/files/gabriel_s_oboe_flute_sheet_music.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/8090/4857/files/93705735883.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/memaroze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6385/2708/files/manual_pull-down_projector_screen_16_9.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_off0000530d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x530D 5244 bytes
SHA-256: 5eba4c8e7f19d1b13013109911bc29d9ebc4ca8ade18a7fecd411d1fdb296a63
font_01_sfnt_off000064e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64E9 10184 bytes
SHA-256: a48a4615bc75e498a9e728aae76475c390a47d16174ae8ec5c7d304df9983ba6

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