Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d2733e1cdd19504…

MALICIOUS

PDF

43.3 KB Created: 2020-09-30 17:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a02952d5312e935a8144d179d1c50d28 SHA-1: d92abae790c4f049fc47a745a0d74ec0b21ef76b SHA-256: 7d2733e1cdd195048d3f011e3aa15cc00aadcb12ab47412d8e0fe7c238ed01b0
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 the primary URL pointing to a known malicious redirector. The heuristic firings indicate this is a malicious redirector and part of a link farm, suggesting the document's purpose is to drive traffic to malicious sites. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier output strongly suggest 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://gettraff.ru/strik?keyword=epinephrine+iv+davis+pdf In PDF document text
    • https://site-1036886.mozfiles.com/files/1036886/poxan.pdfIn PDF document text
    • https://site-1036835.mozfiles.com/files/1036835/10547816070.pdfIn PDF document text
    • https://site-1036781.mozfiles.com/files/1036781/50356387543.pdfIn PDF document text
    • https://site-1037235.mozfiles.com/files/1037235/retumodoz.pdfIn PDF document text
    • http://zuxuzu.krewsonskreations.com/uploads/1/3/1/3/131380500/togakoredijax.pdfIn PDF document text
    • http://dires.atomicgolf.club/uploads/1/3/1/8/131856772/4f22f996.pdfIn PDF document text
    • http://files.mgagymnastics.blog/uploads/1/3/0/9/130969381/lireronafavego.pdfIn PDF document text
    • http://rawezar.gogaphotographylondon.com/uploads/1/3/2/8/132814930/604f4b394fe3a0d.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/1/0438/4676/2656/files/network_security_tutorial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9183/5546/files/pumux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/5262/1973/files/29533946335.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0472/2599/5429/files/search_engine_optimisation_techniques.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0386/1401/files/getuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5004/4069/files/kuwelojuzi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6559/7342/files/phosphorus_orbital_notation.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_off00006191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6191 5116 bytes
SHA-256: cae7ddfdcb077e7464cb7a3e1259efc4223e65cd25ea6380c45e818018de1e9d
font_01_sfnt_off000072fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72FD 14596 bytes
SHA-256: f5ec326daba4cb5fe36f8cf3525ea31d6fddf019cd3e092aaa602e969309e474

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