Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c66298c11eebb5…

MALICIOUS

PDF

40.7 KB Created: 2020-08-29 13:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67360ff1675141bcced164db9006be08 SHA-1: ee8c675fd7ed928ea2eabaea5a13dca4168f65f0 SHA-256: 13c66298c11eebb53dcf4bea7426c4cc8e2c1d739454bc475139df57d39b7ad6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, one of which, 'https://ttraff.ru/wix?keyword=manual+de+maquina+de+coser+singer+simple', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to a sewing machine manual, suggesting a lure to trick users into clicking the malicious link. The presence of numerous other PDF links indicates a link farm strategy.

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/wix?keyword=manual+de+maquina+de+coser+singer+simple
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/3020/0991/files/shear_force_and_bending_moment_experiment.pdf
    • https://cdn.shopify.com/s/files/1/0434/3998/0710/files/35454272774.pdf
    • https://cdn.shopify.com/s/files/1/0434/0632/7975/files/airbus_a350_cockpit.pdf
    • https://cdn.shopify.com/s/files/1/0434/2041/8198/files/wununekupodamifosefupa.pdf
    • https://static.usrfiles.com/ugd/b8c837_58c7cd9e7fb84697a096215b1eac9c71.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b3f0b65bf3644adac43ea71689f2f6b.pdf
    • https://static.usrfiles.com/ugd/409ca8_eb3a387a9d554d72bd79e820ddb8bc5b.pdf
    • https://cdn.shopify.com/s/files/1/0435/0862/9663/files/85111642719.pdf
    • https://cdn.shopify.com/s/files/1/0438/4686/0960/files/bennigan_s_menu_nutritional_information.pdf
    • https://cdn.shopify.com/s/files/1/0451/1550/6853/files/meningococcal_meningitis_prophylaxis_nice_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0106/files/zeruru.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lewajoranuputefikilos.pdf
    • https://cdn.shopify.com/s/files/1/0434/0164/2135/files/custom_discord_font.pdf
    • https://cdn.shopify.com/s/files/1/0438/8922/9979/files/jasunuduzenimod.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_off00006129.bin
fe47e5539ca8ec7d3498db8c8a456f8b16b7edf9e45dc38b219f72ae76c03ad4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6129 5524 bytes
font_01_sfnt_off000073ca.bin
c4545f423e710ac45a74021497d7faffb2b290563ff07b491cf363d43e5de460
pdf-font-stream PDF embedded font (sfnt) at offset 0x73CA 10076 bytes