Malicious PDF — malware analysis report

Static analysis result for SHA-256 50de406b52fa28eb…

MALICIOUS

PDF

33.7 KB Created: 2020-11-08 12:48:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 85708de647dafd4018ee30dbd6083cf3 SHA-1: d098a78617b32638e853ce0206ba33dd07080dd6 SHA-256: 50de406b52fa28eb60abe5c02557b281b4ac718670c3b0bd8e16142d0dce5028
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains multiple URLs, suggesting a link farm or redirection attempt. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL points to a phishing or scam attempt.

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://ggtraff.ru/123?keyword=author+s+purpose+pie+ed+worksheets In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379491/normal_5f9cecfa07665.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_5f8b635a056f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379733/normal_5f986069a7694.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415742/normal_5fa1bf04d945a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389585/normal_5f91004b5f5f6.pdfIn PDF document text
    • https://luragelekow.weebly.com/uploads/1/3/4/3/134377287/8210490.pdfIn PDF document text
    • https://disoguvofuvofum.weebly.com/uploads/1/3/4/5/134502262/7090177.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2db94ebb-85bd-4c76-a285-1056a91f04ec/96484790519.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/91810178802.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/dijuribotuzifigazolibig.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/assemble_nationale_du_mali.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/wopogibututor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13bc3fe9-a0e2-45cf-a5f4-d9ea7d6bdc4f/79565166074.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/jumakeladubet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a93aa63-4703-4319-b646-0de761affee7/gusalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01f9afba-46a9-4f26-9d39-9e3fcaad586b/9507321318.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_off00004a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A22 4948 bytes
SHA-256: 375fab1f8ddc39bd341b02d7e22234dcdf3c532d699ce8d6985b82b40758f00a
font_01_sfnt_off00005b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B06 9080 bytes
SHA-256: 689ce21c40e745b9d5d2562ec79d9a465b6218bd091cd571f8417cb606780d16

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