Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0101eca917fd656…

MALICIOUS

PDF

36.1 KB Created: 2020-10-30 21:08:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 813ca8295c5f8587c0e66dac6a0b7642 SHA-1: 2000cb64c42dba0284e698f21f345741ad69c171 SHA-256: c0101eca917fd6560b2a098fb79a4037af4d3d9b8c652cbf3ea560461c4fb325
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, indicating a link farm. One of the primary links, 'https://ttraff.me/123?keyword=hdfs+2367+osu', is identified as a known malicious redirector. This suggests the document is designed to lure users into clicking malicious links, likely leading to further stages of infection or phishing attempts.

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.me/123?keyword=hdfs+2367+osu In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409096/normal_5f989705aebf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420930/normal_5f9af244a7be3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393345/normal_5f92032ee674b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5f8de8fe703d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5f870266ac877.pdfIn PDF document text
    • https://wobafedufuj.weebly.com/uploads/1/3/4/0/134012960/satibazu_suwazidigo_xomagesimabog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5f937ebb5f4ea.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/kudowo/small_story_to_learn_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f24e15b-1115-4d4d-bf60-b790df4efd12/15096588264.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/bmr_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/types_of_government_contracts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cc7f92e-61d2-4e6e-a30c-076668fd6a2d/sopirivebominemeba.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_off00004ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EA4 5052 bytes
SHA-256: 42f3c064abf3b4385205069aca0cfd38015d1a5523733b21e90b6a7776811741
font_01_sfnt_off00005ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF8 10676 bytes
SHA-256: c0c3f0ceb53e4492c9bb7e203b3e6267be4456f930e8399f2377826f63a7195b

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