Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c928cc691193ca…

MALICIOUS

PDF

44.0 KB Created: 2020-10-01 14:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6904ffd82959a1abe903b77caa0cb3e2 SHA-1: 5232313022fc4bd7fc459506207351ac0d1ff2d3 SHA-256: 01c928cc691193cac2098c73b386169bef6168585ee39b749e3ff989786f17f6
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 PDF files hosted on external sites, forming a link farm. One of these links, https://gettraff.ru/strik?keyword=abg+analysis+procedure+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to direct users to malicious content. 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=abg+analysis+procedure+pdf In PDF document text
    • http://files.trenchninja.com/uploads/1/3/1/4/131453274/faxutejogix_zetazirufubevo_fujosamadutafos.pdfIn PDF document text
    • http://kenik.bxsci83yearbook.org/uploads/1/3/0/7/130738705/3fce595796d08.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/1/0464/5499/7160/files/wynk_cracked_apk_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5039/4019/files/something_just_like_this_piano_sheet_music_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6022/3382/files/49979342651.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/jiwubagugamutetilonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd766061-d0e4-46a6-8e48-947908f8cfb0/44327416777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c6605c7-d727-4fe3-9e27-e8d87f48aaf2/15183600836.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5029f203-161f-4dc0-8e13-cb2d13e36d34/murufuzizerezok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5969/9109/files/vujerapobu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9683/4212/files/xifenaxasafetalunuteduwum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0854/0320/files/sarna_en_perros_tratamiento.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9645/4808/files/66332569744.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_off00006e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E45 5552 bytes
SHA-256: b7385227a0d5937202043a3a51829d4b6791c7d0f299a81fba6092839748e565
font_01_sfnt_off00008140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8140 10060 bytes
SHA-256: b40c61f5755cd260307a7912cac2400fdbd45eeb6f62d02d6738872aefeeef3e

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