Malicious PDF — malware analysis report

Static analysis result for SHA-256 91566f5c81474aec…

MALICIOUS

PDF

44.4 KB Created: 2020-08-11 16:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c30c54792af9e385f8406ed3e7263ca9 SHA-1: 0b6681035e1cc02f54806bd996c48828e61fbe91 SHA-256: 91566f5c81474aec71826749898420f669de91b893c106b152659e0712d22f69
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=cost+auditing+standards+pdf'. The document body, though heavily obfuscated, also contains this URL and other links to Shopify-hosted PDFs. This suggests a coordinated effort to direct users to potentially harmful content, likely for phishing or malware delivery.

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.ru/pify?keyword=cost+auditing+standards+pdf
    • http://lenoto.rvbc.org/uploads/1/3/2/6/132683014/mazinile_xufolefodufewi_nusub_joleli.pdf
    • http://joxolub.organiclivinginchrist.org/uploads/1/3/0/8/130874330/pediwukewelirot.pdf
    • http://files.jewellersguildofgreatersandringham.com/uploads/1/3/1/4/131406659/doxerifo.pdf
    • http://files.healthydentistrysolutions.com/uploads/1/3/2/8/132816195/6887138.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9841/files/lodevumolazipibawemi.pdf
    • https://cdn.shopify.com/s/files/1/0440/1384/6693/files/xijafugeditipi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0334/7097/files/83266057750.pdf
    • https://cdn.shopify.com/s/files/1/0437/3427/0101/files/fibaxerajirive.pdf
    • https://cdn.shopify.com/s/files/1/0430/0508/3811/files/fake_company_name.pdf
    • https://cdn.shopify.com/s/files/1/0428/9911/2099/files/woxilenavabamonon.pdf
    • https://cdn.shopify.com/s/files/1/0433/0523/8688/files/anomie_sociology.pdf
    • https://cdn.shopify.com/s/files/1/0430/2451/5229/files/air_cooled_chiller_vs_water_cooled_chiller.pdf
    • https://cdn.shopify.com/s/files/1/0432/0237/9939/files/74204425331.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/juzajomafe.pdf
    • https://cdn.shopify.com/s/files/1/0429/8244/1113/files/jonixumawegefoxokujexiwe.pdf
    • https://cdn.shopify.com/s/files/1/0435/8209/5519/files/2597885323.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_off00006ede.bin
3c27c408eb4ec318ff33ab6ac20048d95ba167a7c8a13febccc73aeeadcf751d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EDE 5084 bytes
font_01_sfnt_off0000803a.bin
7e9ec04558f0aae57535579c90b6601da798cd96be46c0274294afb236d99b07
pdf-font-stream PDF embedded font (sfnt) at offset 0x803A 10532 bytes