Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f658309139eee24…

MALICIOUS

PDF

41.8 KB Created: 2020-10-31 22:20:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d2b3a224f06897a64ab06d5b9470e475 SHA-1: dacd4b6e8dab2376a62e68c39f9e2c1e544f43cd SHA-256: 4f658309139eee24ea210ed553ec4922a1c3dd221fb7be51ea44c198bfef9eb4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://ttraff.link/123?keyword=mg+%252B+o2+oxidation+numbers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4391335/normal_5f8ddebc85a5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402289/normal_5f9b8e3be9b89.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0485/2786/8059/files/26876228821.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/8554975553.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/print_to_macro_word.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/nudemokimibim.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/86014432241.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/50_things_the_holy_spirit_does.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e524469f-abe1-4bb4-bd0a-6aee81606649/jakapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d15378c-cc85-4c4a-8116-26ff6e79c9b9/49457446200.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5706 5340 bytes
SHA-256: 3e25758754be95787d8ac73e909524eb264c4066f8b3c0de42e03eff424bf666
font_01_sfnt_off0000691e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x691E 10452 bytes
SHA-256: d223e721161ced1d11460aa4663624d2a4e50a044e1b64203be135595926ef55
font_02_sfnt_off00008cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC8 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361