Malicious PDF — malware analysis report

Static analysis result for SHA-256 c758ed3339b03555…

MALICIOUS

PDF

41.0 KB Created: 2020-08-23 16:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fb98425f820e92c60b66e11a953f979 SHA-1: 150ff9cf27c770848338bbceec54d1a5e0e86ae9 SHA-256: c758ed3339b03555ee9fa6c9f42b26f4c299cc836f959facbddc7150e8f21338
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to Shopify-hosted PDF files, which is indicative of a link farm. One critical heuristic identified a link to a known malicious redirector infrastructure (ttraff.cc). The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily corrupted, contains text related to 'effective and efficient management pdf' and references wkhtmltopdf, suggesting a lure document.

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.cc/pify?keyword=effective+and+efficient+management+pdf
    • http://files.brendachrystie.com/uploads/1/3/2/7/132741476/zeraje-telozusivexogut.pdf
    • https://cdn.shopify.com/s/files/1/0463/2585/8459/files/legal_judgement_on_credit_report_canada.pdf
    • https://cdn.shopify.com/s/files/1/0431/8373/4943/files/princesas_disney_para_colorear.pdf
    • https://cdn.shopify.com/s/files/1/0431/8009/7702/files/4817971018.pdf
    • https://cdn.shopify.com/s/files/1/0437/0841/6165/files/tekefanofininatavedofalib.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kujefitil.pdf
    • https://cdn.shopify.com/s/files/1/0433/4292/1886/files/4187366762.pdf
    • https://cdn.shopify.com/s/files/1/0430/4768/2201/files/92409534979.pdf
    • https://cdn.shopify.com/s/files/1/0443/9549/5590/files/ayurveda_books_in_bengali_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/4894/4295/files/moreredopidesavamixazu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0287/9387/files/60854585538.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2791/files/75069143311.pdf
    • https://cdn.shopify.com/s/files/1/0428/6509/8908/files/jepudepopizojekunif.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_off00006338.bin
10b2643427e22385c7ddc7046160709426308d061bf5e2c82a27526f4ef0c3d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6338 5188 bytes
font_01_sfnt_off000074da.bin
bb67d50e0c4f1241ee11cc45b6c568872ee147bc1355a12f80b409adaa70aff9
pdf-font-stream PDF embedded font (sfnt) at offset 0x74DA 10076 bytes