Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a56929c944ba09…

MALICIOUS

PDF

31.5 KB Created: 2020-09-12 03:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f5bca7ba7c5ecbefb4478521db548a4c SHA-1: 65e037b07d1e5e111436d0579dabc7e6a9e7889b SHA-256: b0a56929c944ba099062d173ca8d00c8f77a8453917f5a6502f06ab9f25f4afa
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a redirector URL that appears to be part of a link farm. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests an attempt to drive traffic to potentially malicious sites. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of 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://ttraff.club/wix?keyword=brown+platform+sandals+steve+madden In PDF document text
    • http://jutagu.arisenutrition.com/uploads/1/3/2/6/132695471/aca23797c6.pdfIn PDF document text
    • http://wasodix.nerdynicodemus.com/uploads/1/3/1/0/131070289/456d1b31ba74c49.pdfIn PDF document text
    • http://files.410ef.com/uploads/1/3/1/0/131070204/b12796d9e24.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/1/0429/9646/5823/files/easy_free_sheet_music_for_piano_beginners.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0469/4376/4641/files/merorekigarete.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0456/8360/5663/files/aosp_keyboard_android_pie.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2558/7610/files/74810957312.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0189/5322/files/19220283042.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/81d6a4_7affd0a73eba4bd3b7f4aad1e2093ec6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/65d6f7_42b612f26bd344698b5195e66c288870.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/185811_2e62e7f29c234ecb96fddccff889f204.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_off00004051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4051 5388 bytes
SHA-256: a7c94aac503023abd33f81774a3f4380cd5054ff31a4b94697007b87b7fbbde4
font_01_sfnt_off000052a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52A9 9080 bytes
SHA-256: 9752cb736b3884af4249fc8b110f318a2351ec60c0fca611f8cc775ad009c858

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