Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b211ab421b98ce…

MALICIOUS

PDF

34.3 KB Created: 2020-09-04 12:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 09b90b326a8e8b1e0ba56f5cfe3f7e6a SHA-1: 1f9938f369cecf8dcce033c4ce1ce758aef2535b SHA-256: 21b211ab421b98cef7aa2ba30ed3ce24ad22db5e0060eeaee0e2603c52e2ed1b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to appear as legitimate textbook PDFs, but the primary link redirects to known malicious infrastructure. The document body, though heavily obfuscated, contains the malicious URL and text suggesting a lure for 'business management ib textbook pdf'. The ML classifier and redirector heuristics strongly indicate malicious intent.

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=business+management+ib+textbook+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/ceb2e8_bce0da9d0ba34bc8b30098e8731e5faf.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_81f7a9d0b08a4f23aefb4664121db55e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3bf302_0ca7f1ffcfa1441eac4dfcf20a666361.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0714/8185/files/28396836544.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/38bf1f_5f409978c47e477fb28326c5c4478fb5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9c43ec_d7e97d4b507c41b390c02fa696889d78.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0058/5636/files/antacid_drugs_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9774/2750/files/matekesa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6092/7393/files/forbidden_woods_map.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_off000046db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46DB 5556 bytes
SHA-256: 2384be92ce03d16c8a70a3bdc6e390dce5755f2e66ae0351c843b06ffd09280e
font_01_sfnt_off000059b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59B8 10356 bytes
SHA-256: 677b176d562d7bdb0ef6c0e79ddf90cc2e9172368b01fd6334a8101f26f7aa72

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