Malicious PDF — malware analysis report

Static analysis result for SHA-256 a17c92a312a57b53…

MALICIOUS

PDF

68.2 KB Created: 2020-10-03 22:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7aea6504e436cbfa710eccf8f2e85221 SHA-1: 7ff8bb12027f23b779a31167ffb677374770c244 SHA-256: a17c92a312a57b534b95386e539ac79901bbbfedd2da2eb9fab1493aa46a7092
184 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm, with a critical heuristic firing for redirecting to known malicious infrastructure. The primary malicious URL identified is 'https://ggtraff.ru/strik?keyword=aut+aut+kierkegaard+pdf+ita'. This suggests the document's purpose is to lure users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the structure and link farm indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/strik?keyword=aut+aut+kierkegaard+pdf+ita In PDF document text
    • https://site-1037033.mozfiles.com/files/1037033/14992922779.pdfIn PDF document text
    • https://site-1036745.mozfiles.com/files/1036745/37616282811.pdfIn PDF document text
    • https://site-1036936.mozfiles.com/files/1036936/mokilexere.pdfIn PDF document text
    • http://files.artistbrinsleytyrrell.com/uploads/1/3/0/7/130740187/ralepokebi.pdfIn PDF document text
    • http://files.cnpensioners.ca/uploads/1/3/1/8/131856877/girefasijagazupaduv.pdfIn PDF document text
    • http://files.marketmenz.co.nz/uploads/1/3/1/4/131409621/1434775.pdfIn PDF document text
    • http://mozevisos.goldingtouch.com/uploads/1/3/1/4/131453329/8908262.pdfIn PDF document text
    • http://files.wyomingspeechlanguagehearingassociation.org/uploads/1/3/0/8/130813489/1f0840.pdfIn PDF document text
    • https://site-1036926.mozfiles.com/files/1036926/28789427974.pdfIn PDF document text
    • https://site-1037212.mozfiles.com/files/1037212/debiv.pdfIn PDF document text
    • https://site-1037037.mozfiles.com/files/1037037/70617431457.pdfIn PDF document text
    • https://site-1037102.mozfiles.com/files/1037102/vekeditemovijita.pdfIn PDF document text
    • https://site-1037266.mozfiles.com/files/1037266/26276240908.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/1/0432/7397/8011/files/adventures_in_japanese_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5071/9637/files/navy_seal_pst_swim.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_off0000c38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38C 5052 bytes
SHA-256: 030bc31d825789832786c2c64b3eab0707467a25c7c895cdd1aaa6ad82b032cc
font_01_sfnt_off0000d4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D7 14568 bytes
SHA-256: 8203329818f5e6b76eb866b282ffbc194e90139b35dd219318ed7674d734447c

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