Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a44610219ac4923…

MALICIOUS

PDF

40.7 KB Created: 2020-11-03 03:08:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ebf558abf6b63bde7450c9f6f3c2eda1 SHA-1: 296d5c25e8a177dae3c2e4e8f8cb720ed76e3da3 SHA-256: 7a44610219ac4923d71a16c485a9a728b6ebb6b536a7c006ddd7ce5f1182d0fc
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.cc/123?keyword=bill+of+rights+for+kids In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5f957551a8ec7.pdfIn PDF document text
    • https://suzulazupe.weebly.com/uploads/1/3/3/9/133997697/737148.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417119/normal_5f9a9c157ed81.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/saboroligugomonuzujejoxu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/4461/7371/files/sejenijin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9225/4105/files/lonet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e33ea28c-551e-40ae-9c7f-7366c06bc8f5/digezejowowezitebuwidijo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0233/0791/files/dagannoth_rex_guide_ironman.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/fufasajatijix.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/manorama_weekly_novels.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/0739/1920/files/68795950225.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_off00006308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6308 5072 bytes
SHA-256: f49fdf7baa89992b21f166310b49b4e9bb64a6bd22b034a180cb48ef5b2bbe4a
font_01_sfnt_off00007447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7447 10028 bytes
SHA-256: 8cc049f641bd6d7a19ddc15e76407a5c6856e324e3895c898756b233655637ac