Malicious PDF — malware analysis report

Static analysis result for SHA-256 71762012390a6cbd…

MALICIOUS

PDF

34.8 KB Created: 2020-08-07 09:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b23b8c07dcea1f6fc901a74df5ce8100 SHA-1: 270d19cbe14863444e4546c6b5cda091ec70d3d9 SHA-256: 71762012390a6cbd8988f82d792f4fc7d23ad0e612239a75b3de3eaaf68f3bd5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF file contains a significant number of embedded links, many pointing to external PDF files hosted on various domains. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.com), suggesting a potential phishing or malware distribution attempt. The presence of numerous PDF links also indicates a possible SEO link farm tactic. The ML classifier 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=aircraft+structures+by+peery+and+azar+pdf
    • http://files.mondaymorningmusicclub.org/uploads/1/3/2/6/132695780/1043747.pdf
    • http://files.theracingcollective.com/uploads/1/3/2/7/132740594/3602724.pdf
    • http://files.psychchange.org/uploads/1/3/1/6/131637150/rapumomojokor.pdf
    • http://matir.mrstrizz.com/uploads/1/3/1/4/131453060/zaposonewudimin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/5989/4689/files/morgans_used_cars_canon_ga.pdf
    • https://cdn.shopify.com/s/files/1/0437/5301/3409/files/xozitifi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3437/7372/files/light_novel_translations.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11783771814.pdf
    • https://cdn.shopify.com/s/files/1/0434/3414/7989/files/tipovoduwem.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0152/files/8762232508.pdf
    • https://cdn.shopify.com/s/files/1/0433/4655/9127/files/convert_litres_to_gallons.pdf
    • https://cdn.shopify.com/s/files/1/0429/1769/1559/files/cow_gestation_chart.pdf
    • https://cdn.shopify.com/s/files/1/0429/1480/7974/files/data_analysis_in_descriptive_research.pdf
    • https://cdn.shopify.com/s/files/1/0431/4329/9228/files/79220755009.pdf
    • https://cdn.shopify.com/s/files/1/0439/0970/9976/files/daxino.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_off00004d50.bin
a83552b82dfa4ba94ee8b00d9e7c1555de24872a372b5403915823313aba0849
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D50 5400 bytes
font_01_sfnt_off00005fca.bin
6ff785a28eef6263d0d565eb48cb712bfdb1a3663a3fb7e2d4dc09f6e9a181ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCA 8820 bytes