Malicious PDF — malware analysis report

Static analysis result for SHA-256 df22f7bbe5254103…

MALICIOUS

PDF

43.1 KB Created: 2020-08-06 23:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a85f277976c1dae76128cb18cfb954ae SHA-1: d029f325a4c4661bd8746cd1daddcb09320dbfb4 SHA-256: df22f7bbe5254103e5e74c4bd771f7743734ecc9a8f919bfe503a525303817c0
150 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 heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The primary malicious URL is https://ttraff.com/pify?keyword=math+puzzles+brain+teasers+with+answers+pdf. The document body, though heavily obfuscated, contains references to the same lure and URLs. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=math+puzzles+brain+teasers+with+answers+pdf
    • http://rivinul.grassyforkelementary.com/uploads/1/3/0/7/130739430/mukukugokozudufupal.pdf
    • http://files.jimmyzhan.ca/uploads/1/3/2/6/132682124/5764269.pdf
    • http://files.spunglasstheatre.com/uploads/1/3/2/6/132680962/nuwej.pdf
    • https://cdn.shopify.com/s/files/1/0437/1880/3607/files/41585837321.pdf
    • https://cdn.shopify.com/s/files/1/0432/6427/8686/files/who_is_chris_pine_s_grandmother.pdf
    • https://cdn.shopify.com/s/files/1/0438/7235/4459/files/lipid_classification_structure_and_function.pdf
    • https://cdn.shopify.com/s/files/1/0429/0225/7823/files/43671074769.pdf
    • https://cdn.shopify.com/s/files/1/0437/8332/3806/files/teoria_causalista_libro.pdf
    • https://cdn.shopify.com/s/files/1/0430/6901/4177/files/fajixumuravik.pdf
    • https://cdn.shopify.com/s/files/1/0428/9062/5191/files/lepemeforakibabugitatof.pdf
    • https://cdn.shopify.com/s/files/1/0431/1891/9837/files/anglo_saksonlarn_stnlnn_sebepleri_nelerdir.pdf
    • https://cdn.shopify.com/s/files/1/0429/5042/6787/files/dametuxuvobexuwejewu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3169/1421/files/probability_concepts_in_engineering_solution_manual.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_off0000695e.bin
728446dd80ce3f45e0e5c00829569b101e8dbb4c8014f116e0578b539d0699c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x695E 5416 bytes
font_01_sfnt_off00007bdf.bin
31a0124cda89ec5093ac0cf49924ba712778502eba75d6788ddd3c249cdba598		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BDF 10500 bytes

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