Malicious PDF — malware analysis report

Static analysis result for SHA-256 37cc81e8cdfe582d…

MALICIOUS

PDF

37.4 KB Created: 2020-08-26 16:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1709d0e220e35209c5d2bb9b08d313c SHA-1: d8b39e18709db2428c3f140582923445a79a21d5 SHA-256: 37cc81e8cdfe582d92bec0ae50cec773eb3136a69fadd138bd5ecd25306efe6a
150 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified links pointing to known malicious redirector infrastructure, specifically 'https://ttraff.com/pify?keyword=aikawa+saki+anime'. Another heuristic indicated a PDF link farm, with many links pointing to Shopify domains, likely for SEO manipulation to distribute malicious content. The document body contains garbled text and the malicious URL, suggesting a lure to a malicious site.

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=aikawa+saki+anime
    • http://files.la-enthusiast.com/uploads/1/3/1/3/131398129/3756468.pdf
    • http://files.supercoolcustoms.com/uploads/1/3/0/8/130813796/2778933.pdf
    • http://rolije.hendrygeosciences.com/uploads/1/3/1/4/131407089/suribogawelarator.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/el_ambito_de_la_filosofia_practica.pdf
    • https://cdn.shopify.com/s/files/1/0432/2426/8968/files/96186116162.pdf
    • https://cdn.shopify.com/s/files/1/0440/8714/8709/files/besivuwe.pdf
    • https://cdn.shopify.com/s/files/1/0435/3743/2744/files/nijiwakofisipabof.pdf
    • https://cdn.shopify.com/s/files/1/0462/3145/3847/files/zukakorubeveturi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3849/8206/files/zuben.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46676539889.pdf
    • https://cdn.shopify.com/s/files/1/0439/4031/5294/files/building_drawing_book_for_diploma.pdf
    • https://cdn.shopify.com/s/files/1/0432/2705/4237/files/totosumava.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nemevisofopanufu.pdf
    • https://cdn.shopify.com/s/files/1/0449/8269/8142/files/water_and_wastewater_engineering_davis.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/chemistry_handwritten_notes_for_upsc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004560.bin
2223d465ec6cdbcd6e7a7c7300de542e4d0bd4e16883bac58d383a46e646dfe8
pdf-font-stream PDF embedded font (sfnt) at offset 0x4560 3764 bytes
font_01_sfnt_off000052b9.bin
798c6ab302ff973f4fccc5396f03188d3c999d2543958a1e8df976aff7151d3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x52B9 4848 bytes
font_02_sfnt_off00006331.bin
b44afec880824daa06bc1bf05d1641480ba8862d428583ed4206dadd43ddcee3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6331 10892 bytes