Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc509f535fafbd0…

MALICIOUS

PDF

51.9 KB Created: 2020-08-09 16:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a0e2d37e35bbe8ec94cde4308d12454 SHA-1: 1a50c4441680ca2f823320b15ed5bd043b48117d SHA-256: efc509f535fafbd0188ef670e97f177918864a8639cdbdba12c5fd626bf6e559
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic indicates a malicious redirector link to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect users to malicious infrastructure. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a phishing or redirection attack.

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.com/pify?keyword=alternating+current+circuit+analysis+pdf
    • http://files.elancommunities.com/uploads/1/3/1/1/131163960/8890601.pdf
    • http://files.charmcitypetcrematory.com/uploads/1/3/1/6/131607522/wekazogawol.pdf
    • http://putek.corporatechilllout.com/uploads/1/3/0/8/130874104/nimumomovozi.pdf
    • http://files.yarramlandcare.org/uploads/1/3/1/4/131437680/nuwaxi.pdf
    • http://files.dragonninjawriter.com/uploads/1/3/0/7/130739835/894448.pdf
    • https://cdn.shopify.com/s/files/1/0430/2602/2554/files/71235254336.pdf
    • https://cdn.shopify.com/s/files/1/0438/0780/1504/files/arun_sharma_data_interpretation_8th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/7584/3736/files/grade_3_math_addition_and_subtraction_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0432/8731/4590/files/24138671143.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5268/files/59660512537.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9489/files/51771872469.pdf
    • https://cdn.shopify.com/s/files/1/0433/4131/6249/files/prentice_hall_physical_science_concepts_in_action_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0450/4892/2270/files/adnams_wine_list.pdf
    • https://cdn.shopify.com/s/files/1/0437/6310/5953/files/prison_break_episodes.pdf
    • https://cdn.shopify.com/s/files/1/0432/5189/2381/files/rikumodidovoxefategobeda.pdf
    • https://cdn.shopify.com/s/files/1/0432/1899/3320/files/automata_theory_ebook.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8448/files/past_perfect_affirmative_negative_interrogative.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_off00008cbe.bin
95f41c8bda2ec38c6787f23e020a02258d07e7a6cf6331780d3c8fa55e8be351		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CBE 5416 bytes
font_01_sfnt_off00009f44.bin
5540adeb27896d0414c7424f7a0c7384c05d898eab033ebe93d84c17025fd172		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F44 10192 bytes

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