Malicious PDF — malware analysis report

Static analysis result for SHA-256 827c11cfb4d1758f…

MALICIOUS

PDF

48.0 KB Created: 2020-10-31 23:48:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 07c8baf8e2720b2aef2ed01c2c28ef9b SHA-1: 172667cd73576c95c14be61424dd903911f6429d SHA-256: 827c11cfb4d1758fc573f70d713bdba2d7d66af7ad8b5fc3ea955f2aa602ac34
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, also contains the same redirector URL. This suggests the primary purpose is to lure users to malicious sites, likely for further exploitation or phishing.

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=mongoose+brawler+rear+wheel+bearings In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403954/normal_5f98c38c19977.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369160/normal_5f8894cb579b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367287/normal_5f8b0301c99e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370089/normal_5f8d3140202a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404103/normal_5f9dbbc37205f.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://s3.amazonaws.com/rawesaragegugar/54700847571.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b305529e-6293-43cd-8b94-b967d182d58e/jotonabufiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6122d82d-85b2-44e8-860c-7c564e8f3ed1/migezuxike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fdf6304-fcb3-47d3-b02e-a1088dcd4c22/ziruzeboluga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7404/3038/files/circular_saw_guide_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/316f7be4-aba6-4d04-84ea-a3bd46ca5b65/spelling_bee_words_1st_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/37224608210.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_off00006dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC3 4892 bytes
SHA-256: 2f8b61fbe6055d5cd1e8b18f0f3116f2c8886f6878696a3e04ab7b8717f2ec11
font_01_sfnt_off00007e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E65 11316 bytes
SHA-256: 396797e231b05e263c514385f483886e336207709fa4da8dd194ab59c6bacd81
font_02_sfnt_off0000a4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4B1 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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