Malicious PDF — malware analysis report

Static analysis result for SHA-256 766b4adc0d62679e…

MALICIOUS

PDF

44.9 KB Created: 2020-08-16 12:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70f6f9f0890b63ae2afe941a3d89af25 SHA-1: 6e8496d97d9af9da161409e1299573d1f1f0e85b SHA-256: 766b4adc0d62679e58d3d6f5920eac7ddd7eccdc897487139effe1b90bf253c2
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wb?keyword=manual%20transmission%20driving%20school%20pittsburgh'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, one of which is a Shopify URL. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. No scripts were extracted, but the presence of embedded URLs and the redirector heuristic suggest a phishing or redirection attack.

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/wb?keyword=manual%20transmission%20driving%20school%20pittsburgh
    • http://buboxuluv.victorialrudolph.com/uploads/1/3/2/7/132740609/nixiwivugudu.pdf
    • http://files.jeffersonelementarypta.org/uploads/1/3/2/6/132681322/mijebofuworisil.pdf
    • http://files.ultimatefitnessbootcamp.org/uploads/1/3/0/7/130738969/f3c8cc53d1643.pdf
    • http://files.timhaleygroup.com/uploads/1/3/1/8/131871618/jizepav.pdf
    • http://vemebil.charbeneaudesigns.com/uploads/1/3/2/3/132303382/8126980.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/7967/0689/files/83684518386.pdf
    • https://cdn.shopify.com/s/files/1/0431/0247/0305/files/nomimitumi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5698/7303/files/wavifojid.pdf
    • https://cdn.shopify.com/s/files/1/0434/7016/0032/files/51750106099.pdf
    • https://cdn.shopify.com/s/files/1/0433/6173/0719/files/fojebojefulaxomosoxi.pdf
    • https://cdn.shopify.com/s/files/1/0428/1656/9500/files/kojuwemuranewawaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/0537/0791/files/procedural_design_in_software_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0428/4973/0727/files/57049365071.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4248/files/michigan_state_font.pdf
    • https://cdn.shopify.com/s/files/1/0435/1256/1819/files/jivosenotugozukoporupus.pdf
    • https://cdn.shopify.com/s/files/1/0429/5501/4298/files/vemerolagemenigejo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nozawilod.pdf
    • https://cdn.shopify.com/s/files/1/0430/7704/2325/files/kudisufof.pdf
    • https://cdn.shopify.com/s/files/1/0434/9824/2214/files/limekevixujuro.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064a5.bin
d0810791d37bea8b04d09935b3eb2d1c8210374936818bed962e6338caa9f708		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64A5 5456 bytes
font_01_sfnt_off000076f9.bin
259eff9461a2556362c2b50155bfe53d30ae3c02bbeb70e80a7e7db8e7e11752		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76F9 9720 bytes
font_02_sfnt_off00009831.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9831 4324 bytes

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