Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8b25b4b4a0536f…

MALICIOUS

PDF

40.1 KB Created: 2020-09-07 11:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e39924d09f770c0f1e7b5d7d40248cff SHA-1: 9e07696ead42b9205e4f8607a20a88b22defb11c SHA-256: 9c8b25b4b4a0536fbe32d70334636915b88e3c3abccda9b3a8c93070ba428ef5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the 'ttraff.me' domain. The document body, though heavily obfuscated, contains text related to 'Babel the language magazine pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The ML classifier strongly indicated maliciousness, and the presence of numerous embedded URLs points to a phishing or redirection campaign.

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/pify?keyword=babel+the+language+magazine+pdf
    • https://static.usrfiles.com/ugd/d93890_1e9b81b0645c4e2b9582549e9e472327.pdf
    • https://static.usrfiles.com/ugd/c33cdb_fd96218d13b147488c630de9da6f7623.pdf
    • https://static.usrfiles.com/ugd/3dd68e_a0d7bcf022644d7b96100f76e7259a9d.pdf
    • https://static.usrfiles.com/ugd/3a38e0_dbeb68153b694f6c904ed2a8c51a19a9.pdf
    • https://static.usrfiles.com/ugd/3c2e2e_6017f197b196467d9aa3fd3d1b77d007.pdf
    • https://cdn.shopify.com/s/files/1/0439/0728/5147/files/gym_workout_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/9050/2042/files/osha_guidelines_for_formaldehyde_exposure.pdf
    • https://cdn.shopify.com/s/files/1/0429/3787/6639/files/makalah_obat_anti_jamur.pdf
    • https://cdn.shopify.com/s/files/1/0435/3146/8951/files/random_group_name_generator.pdf
    • https://cdn.shopify.com/s/files/1/0437/5671/6186/files/freeden_ideologies_and_political_theory_a_conceptual_approach.pdf
    • https://cdn.shopify.com/s/files/1/0429/3961/3347/files/bavuk.pdf
    • https://cdn.shopify.com/s/files/1/0450/4230/3140/files/arcmap_10._5_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0432/6539/2804/files/piperul.pdf
    • https://cdn.shopify.com/s/files/1/0451/1596/5605/files/flip_mino_high_definition.pdf
    • https://cdn.shopify.com/s/files/1/0435/8848/5288/files/linear_inequalities_in_one_variable_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/1392/1175/files/31005287562.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ccb.bin
c39ffe79a34f8b840cd21734acce9e7c37b595641168eb2b3287bc8a46ee7654		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CCB 5420 bytes
font_01_sfnt_off00006f1d.bin
8239a43aeced0c0a9b240846efd4f76b65d38ad2a0bbb289e42d4cb783320974		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F1D 10728 bytes

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