Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a997c5a2b4185d…

MALICIOUS

PDF

41.3 KB Created: 2020-08-14 10:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 984216998280a8d2c64e8237933ffba7 SHA-1: 41d86d83cf540b497782470aa820571045f7bedd SHA-256: 70a997c5a2b4185d4bd74b1fa69fa0faa6ee5db837f541db89406ea0de87935a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body also contains a prominent link to 'ttraff.com', which is likely part of a link farm designed to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=google+sheets+app+sort+alphabetically
    • http://files.vietnamesestudies.org/uploads/1/3/1/6/131606874/lexipodikudeva.pdf
    • http://files.artistangst.com/uploads/1/3/1/1/131164252/bujurikoxavolox.pdf
    • http://dolabo.brew-tech.org/uploads/1/3/1/3/131379057/zomosuzib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0452/3737/1037/files/wings_of_fire_book_11_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/6849/6798/files/mijudowukosu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7896/6686/files/pdf_of_beta_distribution_of_second_kind.pdf
    • https://cdn.shopify.com/s/files/1/0440/8272/5029/files/types_of_animals_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nalekubaserigudopen.pdf
    • https://cdn.shopify.com/s/files/1/0433/6759/6184/files/91954591428.pdf
    • https://cdn.shopify.com/s/files/1/0433/1690/4104/files/because_internet.pdf
    • https://cdn.shopify.com/s/files/1/0438/3863/6192/files/79605281775.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/jifovitix.pdf
    • https://cdn.shopify.com/s/files/1/0428/2197/6220/files/72707431275.pdf
    • https://cdn.shopify.com/s/files/1/0431/9644/8917/files/fuxido.pdf
    • https://cdn.shopify.com/s/files/1/0428/2069/8268/files/28064051359.pdf
    • https://cdn.shopify.com/s/files/1/0437/6412/1757/files/41533873815.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060b1.bin
94fb3bcd63c35e2341b97599bfcac0073ae5dd1bf3381a2aa4d87035265d7c45
pdf-font-stream PDF embedded font (sfnt) at offset 0x60B1 5468 bytes
font_01_sfnt_off00007351.bin
3b166f9f6568f5aa72fa85dc35acb83abe0b547d3c7147d78fb549068f08eb2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7351 10728 bytes