Malicious PDF — malware analysis report

Static analysis result for SHA-256 be77ee2faa74b6b8…

MALICIOUS

PDF

48.7 KB Created: 2020-08-08 17:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f9961d943c25cedd4425631f56a1730 SHA-1: 8bd837b459ca358a34a1ca0d5425edc1fb51c867 SHA-256: be77ee2faa74b6b8e4926bcfd98dc61b5238b348ff0319f04d8153b64210ecdf
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL is https://ttraff.ru/pify?keyword=impact+of+globalization+in+tanzania+pdf, which is likely intended to lead the user to further malicious content. The document body, though heavily obfuscated, also contains this URL, reinforcing the malicious intent. The ML classifier strongly supports the malicious verdict.

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=impact+of+globalization+in+tanzania+pdf
    • http://rugak.nightingaleestate.myhackney.org/uploads/1/3/2/6/132695663/d502f978e9eaf67.pdf
    • http://files.mytgob.com/uploads/1/3/0/7/130776096/nitom.pdf
    • http://xetixaful.iloveacorns.com/uploads/1/3/1/4/131452903/29ca41bc913.pdf
    • http://files.calvarybaptisthopewell.com/uploads/1/3/0/8/130814052/9a04a705c11e069.pdf
    • https://cdn.shopify.com/s/files/1/0433/9813/5966/files/simplified_aircraft_design_for_homebuilders_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/0074/2567/files/95464394785.pdf
    • https://cdn.shopify.com/s/files/1/0431/2737/3990/files/javascript_format_number_with_commas.pdf
    • https://cdn.shopify.com/s/files/1/0433/3967/7855/files/xizafur.pdf
    • https://cdn.shopify.com/s/files/1/0433/3587/6776/files/all_fruits_names_in_english_to_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2795/files/vizodotikirojatupedig.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/82548186924.pdf
    • https://cdn.shopify.com/s/files/1/0428/0451/0887/files/ata_maha_kusal.pdf
    • https://cdn.shopify.com/s/files/1/0427/9199/3500/files/muwopibuviriwutotivuson.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/podufa.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/ashp_guidelines_on_adverse_drug_reaction_monitoring_and_reporting.pdf
    • https://cdn.shopify.com/s/files/1/0428/4832/1692/files/xifarojurusedololaxuti.pdf
    • https://cdn.shopify.com/s/files/1/0436/1755/0499/files/50268623708.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_off0000814d.bin
125135f93dc4dc9ffcfae39bed5089a46cd068344319eba395624971a3e535dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x814D 5328 bytes
font_01_sfnt_off00009360.bin
03827eca64cbbad7de5322c7a861988df9cc4a386c0f7313dd4a85067c471f83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9360 9964 bytes

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