Malicious PDF — malware analysis report

Static analysis result for SHA-256 6328a9b589863e8e…

MALICIOUS

PDF

48.1 KB Created: 2020-08-31 01:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72e2cb3e8387e9fa7b5133bf00317144 SHA-1: fcd2708939775cb7e11aed98cfc5a40f81d31cd6 SHA-256: 6328a9b589863e8eaf2cfbb25996692309b952d64548050df519e2874c07de15
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to ttraff.com. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure the user to a potentially malicious site. The presence of numerous other PDF links, while many are benign, indicates a link farm strategy, likely to obscure the malicious redirector.

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/wix?keyword=th%25E1%25BA%25A7y+b%25E1%25BA%25A3y+tr%25E1%25BB%258Dng+g%25C3%25B2+v%25E1%25BA%25A5p
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0816/2974/files/2475234380.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/tutakitimu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4256/9383/files/41312772279.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5013/files/newsela_quiz_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0435/4713/2068/files/62076463516.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5085/files/arithmetic_and_reasoning_books_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0464/9487/5800/files/excel_fiscal_week_calendar_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/0391/2098/files/free_time_ruel_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0428/4396/3555/files/zugejamejedijexave.pdf
    • https://cdn.shopify.com/s/files/1/0429/5242/5631/files/6720956065.pdf
    • https://cdn.shopify.com/s/files/1/0430/0741/0329/files/keluwifozaluz.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7238/files/centurion_5000_watt_generator_oil_type.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1140/files/29215658167.pdf
    • https://cdn.shopify.com/s/files/1/0428/4694/5436/files/61342092041.pdf
    • https://cdn.shopify.com/s/files/1/0465/0467/3430/files/59849325948.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/aromatase_inhibitors_in_breast_cancer.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/42450305780.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d63.bin
0d80c5d9223cdd62c9b067b9055daf0c5463ba9e4236d7b6e7f3b4a4e1858494		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D63 5960 bytes
font_01_sfnt_off0000800d.bin
fb4caa2f5d1109359e073971a9bb2709b5cce6d05cb2a9f78e79d4876fe035b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x800D 22716 bytes

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