Malicious PDF — malware analysis report

Static analysis result for SHA-256 20bf31dedd103d51…

MALICIOUS

PDF

46.7 KB Created: 2020-08-28 04:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1887701299e5823e1f0b38097453bfa SHA-1: a7a3345cc5c09ca72e0d23446b7733e31aef01d3 SHA-256: 20bf31dedd103d511f83b4ce771dda0af8bbf13b97aac5bfda741d297409a77f
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'wedding guide books' and the malicious URL, suggesting a lure. The PDF also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The primary malicious IOC is the redirector URL, which likely leads to a phishing page or malware download.

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=best+wedding+guide+books
    • http://files.engagecamps.org/uploads/1/3/2/3/132303151/c1b51e16f2.pdf
    • https://cdn.shopify.com/s/files/1/0464/6548/2910/files/zubosevipidaxusoj.pdf
    • https://cdn.shopify.com/s/files/1/0461/5376/0931/files/psd_template_free_2019.pdf
    • https://cdn.shopify.com/s/files/1/0436/7355/1001/files/sony_dream_machine_icf-_c318.pdf
    • https://cdn.shopify.com/s/files/1/0438/3817/7430/files/pogidixovotad.pdf
    • https://cdn.shopify.com/s/files/1/0430/6737/5770/files/91018701680.pdf
    • https://cdn.shopify.com/s/files/1/0434/1746/9080/files/63514721252.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/keferejenela.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/clinical_ocular_pharmacology_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0461/7099/6889/files/specific_heat_and_climate_lab_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/6473/7448/files/antonio_vivaldi_biography.pdf
    • https://cdn.shopify.com/s/files/1/0435/4090/6143/files/btec_sport_and_exercise_science_level_3_book.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_off00007b3f.bin
927a8b7ac3c6d5fb0a4ccc3a598f3b3a2228515fd026861bd87a9c573beca8d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B3F 5000 bytes
font_01_sfnt_off00008c68.bin
ff2076ce9ce48265ca2761456a932962bc030f4c26845bfda4b6ed01c8839705		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C68 9992 bytes

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