Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df1e6c13b31d161…

MALICIOUS

PDF

37.9 KB Created: 2020-08-11 01:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ea9509af242af3b201976258190d25a SHA-1: 5fe0a3bb9bc4605de43ca36ccc9c64a7927a5894 SHA-256: 9df1e6c13b31d16134900606f606fc976f11de284a7fa7ffa653c02ea5f65134
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, a technique often used for SEO poisoning to drive traffic to malicious sites. One of the primary URLs, 'https://ttraff.ru/pify?keyword=just+already+yet+present+perfect+pdf', is flagged as a malicious redirector. The document body itself is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but the embedded links are the most significant indicators of malicious intent. No scripts were extracted from this sample.

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.ru/pify?keyword=just+already+yet+present+perfect+pdf
    • http://files.dayillustration-shop.com/uploads/1/3/2/6/132683017/lujus-sinasu-xizowumiwurowu-tibefasazawus.pdf
    • http://logifiji.gettingwellnaturally.com/uploads/1/3/0/8/130814515/ronepubunimagabam.pdf
    • http://files.repllc.net/uploads/1/3/1/4/131453733/zobimop-furubi.pdf
    • http://files.zimmermansailing.com/uploads/1/3/0/8/130815093/medupekadumamot.pdf
    • http://files.bar2nranch.com/uploads/1/3/0/7/130775242/vipebaluxiwo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32600433864.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5993/files/buffalo_wild_wings_nutrition_info.pdf
    • https://cdn.shopify.com/s/files/1/0439/0515/5227/files/vocabulary_games_and_activities_for_teachers.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/absorption_spectroscopy_method.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/momugozuzotaxagipep.pdf
    • https://cdn.shopify.com/s/files/1/0427/6027/4087/files/69229990918.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/66790968051.pdf
    • https://cdn.shopify.com/s/files/1/0438/9139/2664/files/bastard_manga_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/5711/8374/files/manual_de_administracion_de_empresas_agricolas.pdf
    • https://cdn.shopify.com/s/files/1/0440/6450/6006/files/pasar_de_a_word_gratis_online.pdf
    • https://cdn.shopify.com/s/files/1/0428/3482/1287/files/dowepuzulifuduzaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/7463/4403/files/30396473396.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_off000056f7.bin
ff042c81f3a5b044fc0671bd76fa9b1e318fe1f3070004de70818d81498b1dc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x56F7 5240 bytes
font_01_sfnt_off000068de.bin
3837e1c86cbc2b060bc668be1ea35a1aa4399f400a6b4d9f464a5bded40f4ca4
pdf-font-stream PDF embedded font (sfnt) at offset 0x68DE 9848 bytes