Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b91583abfd9ad31…

MALICIOUS

PDF

40.1 KB Created: 2020-08-28 08:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebbe2dfcfbf666d3c6ac4e8f5b5cebab SHA-1: 6d2e271abf324a1dc07f37c803c6269aecce09a9 SHA-256: 0b91583abfd9ad315601d019db45e63a086fd5f4189f54425f9db02dc1186865
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=dossier+professionnel+concepteur+dev`. The document body, though heavily obfuscated, contains this URL, suggesting a phishing or malware distribution attempt. The presence of many external PDF links also indicates a link farm, often used to obscure malicious destinations.

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.ru/pify?keyword=dossier+professionnel+concepteur+dev
    • http://files.richmondhouseclay.com/uploads/1/3/1/0/131070137/fiwikobudo-kofun.pdf
    • http://files.christinevanwalraven.com/uploads/1/3/0/7/130776484/dalom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3812/9823/files/53769801074.pdf
    • https://cdn.shopify.com/s/files/1/0429/6025/7177/files/sbi_online_net_banking_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/1083/4077/files/sudala.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/949986333.pdf
    • https://cdn.shopify.com/s/files/1/0437/4793/4359/files/list_of_antonyms_and_synonyms_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0431/2757/0596/files/88521998714.pdf
    • https://cdn.shopify.com/s/files/1/0432/9242/6405/files/xumamuboniretow.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/rt-_n66u_port_forwarding.pdf
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/19411368064.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3435/files/papiburaxinasesujajox.pdf
    • https://cdn.shopify.com/s/files/1/0435/7108/5475/files/advanced_ms_excel_training.pdf
    • https://cdn.shopify.com/s/files/1/0438/4414/1218/files/pan_africanism_in_south_africa.pdf
    • https://cdn.shopify.com/s/files/1/0439/4388/7016/files/winkawaks_metal_slug.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_off00005d25.bin
b11a9f3be0866fd04c283c3947c54655a964403a526103fddd41257c2fc47765
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D25 5000 bytes
font_01_sfnt_off00006e40.bin
768ef8e475cc5d188d629a73da16b6d7c8cd9cdb4d248412a9676d0a439622db
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E40 11416 bytes