Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a6a5abc08135f0…

MALICIOUS

PDF

48.0 KB Created: 2020-08-21 05:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cf30e7a629654e2ecfc2afd1edd06c0 SHA-1: fc20aa5b36e8363cee841ab5f614f99b2ba030b8 SHA-256: a6a6a5abc08135f00aea4eae049af6503df38f7d164ba5ae9e96c9508262ffe3
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, many of which point to a redirector service (ttraff.ru) or host potentially malicious PDF files. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=b.+e.+degree+full+form, which is flagged as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to distribute malware. The presence of numerous Shopify-hosted PDFs suggests an attempt to blend malicious links with seemingly benign content.

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=b.+e.+degree+full+form
    • http://sotexenu.kalliejo.com/uploads/1/3/0/7/130776208/3c046a3dcab848.pdf
    • http://vogaduze.maplegrovepta.org/uploads/1/3/1/3/131398455/a247840cf84d8.pdf
    • http://files.shhschoir.org/uploads/1/3/0/7/130739225/bekukaxowolegixukug.pdf
    • http://files.claystories.com.au/uploads/1/3/0/7/130738852/morafesiva-mesokuzafeja-lezukuruvalozi-begiferatiw.pdf
    • http://files.grandeprairierugby.com/uploads/1/3/2/7/132740838/robixarew.pdf
    • https://cdn.shopify.com/s/files/1/0435/0086/3643/files/83187984890.pdf
    • https://cdn.shopify.com/s/files/1/0434/6249/2324/files/39100381136.pdf
    • https://cdn.shopify.com/s/files/1/0438/4459/9958/files/1999_toyota_corolla_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0439/4539/4331/files/basic_english_grammar_book_3_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/4012/9692/files/minecraft_mortal_kombat_skin.pdf
    • https://cdn.shopify.com/s/files/1/0431/4316/8156/files/21300914946.pdf
    • https://cdn.shopify.com/s/files/1/0434/1468/3813/files/wovodefemiwunawo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8573/files/milton_sterilizing_fluid_safety_data_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/pagepijezuxo.pdf
    • https://cdn.shopify.com/s/files/1/0435/5103/1464/files/88216254509.pdf
    • https://cdn.shopify.com/s/files/1/0440/8469/1094/files/duxewuwolu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6557/3537/files/60959401140.pdf
    • https://cdn.shopify.com/s/files/1/0437/7044/5975/files/bendix_valve_catalog.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_off000080dd.bin
0039937838aac0dcd34109eec30a28a52bc5d7abf0353dbcdb4ba1ef560522c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x80DD 4920 bytes
font_01_sfnt_off00009183.bin
0700f777758e2205db91605df95114bb4d73bec96984d019262f3d114094d11a
pdf-font-stream PDF embedded font (sfnt) at offset 0x9183 9972 bytes