Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b918eda6d230526…

MALICIOUS

PDF

39.7 KB Created: 2020-08-23 16:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd057ab5ec100e19d9ce366f328a6e40 SHA-1: ed6b5fd77c65737482669e252c7b661e5678cbbe SHA-256: 2b918eda6d2305262304ceab9968ace3e7719881c0b56cbe93e0ee7be69ee8ba
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a high number of embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or redirection strategy. A critical heuristic identified a link to a known malicious redirector at `https://ttraff.ru/pify?keyword=bronchite+asthmatiforme+adulte+symptomes`. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and the malicious URL, reinforcing the intent to redirect users to potentially harmful content.

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.ru/pify?keyword=bronchite+asthmatiforme+adulte+symptomes
    • http://files.artistscorner.gallery/uploads/1/3/0/9/130969206/2318.pdf
    • http://besog.mercedoptometry.com/uploads/1/3/0/9/130969746/moxotexudas-napesekidubi.pdf
    • http://vapigupi.saintgregorysileby.org/uploads/1/3/1/3/131380934/kotebogisarisaf-folijoma-rojugizaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/7804/8151/files/descargar_libro_el_almohadon_de_plumas.pdf
    • https://cdn.shopify.com/s/files/1/0430/8333/3799/files/evidence_based_decision_making.pdf
    • https://cdn.shopify.com/s/files/1/0436/1663/2992/files/javitufiwoditomi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2855/2602/files/liriw.pdf
    • https://cdn.shopify.com/s/files/1/0432/2449/8333/files/69536384239.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/bomuzoweduzisosumifiwaro.pdf
    • https://cdn.shopify.com/s/files/1/0433/1274/2555/files/federation_of_american_scientists_crs_reports.pdf
    • https://cdn.shopify.com/s/files/1/0430/3880/2073/files/65510374059.pdf
    • https://cdn.shopify.com/s/files/1/0437/8171/8165/files/passive_voice_present_perfect_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/1560/1319/files/47340590848.pdf
    • https://cdn.shopify.com/s/files/1/0437/4944/1688/files/cambridge_primary_progression_test_past_papers_english_stage_4.pdf
    • https://cdn.shopify.com/s/files/1/0429/3197/8403/files/fulepasum.pdf
    • https://cdn.shopify.com/s/files/1/0457/6487/0300/files/philips_air_fryer_instruction_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/1538/7811/files/3970924443.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/
    • https://cdn.shopify.com/s/files/1/0437/4944/1688/files/cambridge_primary

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e11.bin
182a2b6ad4170a409296e18ecbcffb311f9b5b7298b5f5607bafdcda038a4b16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E11 5544 bytes
font_01_sfnt_off000070bd.bin
6dc8a9d08cc471f2df50587eba9ac7629161a9dd57d21eab1ac4254588d9bb8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70BD 9672 bytes

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