Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a6dca5956191b8…

MALICIOUS

PDF

41.3 KB Created: 2020-08-29 14:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3100dacd508d8a4337a9cebef24448e0 SHA-1: 73de2ff5359f903c746a51cd34029e16b3049f13 SHA-256: 13a6dca5956191b8543da16d09616379686f8fedf7395a948e5c0dc3b0b95028
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/wix?keyword=gigabyte+ga-78lmt-usb3+%2528rev.+6.0%2529+manual'. Additionally, it exhibits characteristics of a PDF SEO link farm, with numerous external links, including one to 'https://cdn.shopify.com/s/files/1/0430/8336/6551/files/letebelobezudegu.pdf'. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs suggest an attempt to lure users to malicious infrastructure.

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=gigabyte+ga-78lmt-usb3+%2528rev.+6.0%2529+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8336/6551/files/letebelobezudegu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3156/files/apache_poi_tutorial_pdf_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/1705/1039/files/acura_rlx_review_consumer_reports.pdf
    • https://cdn.shopify.com/s/files/1/0434/2212/2151/files/josoruvaril.pdf
    • https://cdn.shopify.com/s/files/1/0437/8850/1143/files/19737916335.pdf
    • https://cdn.shopify.com/s/files/1/0430/3981/7890/files/21837824726.pdf
    • https://cdn.shopify.com/s/files/1/0440/5808/3493/files/minecraft_alex_skin_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/8761/7436/files/delemazenavokuxi.pdf
    • https://cdn.shopify.com/s/files/1/0443/8091/3830/files/nitro_64bit.pdf
    • https://static.usrfiles.com/ugd/b8c837_4938c1590ed8410485e94e545702ccb4.pdf
    • https://static.usrfiles.com/ugd/b8c837_1abaf3a6c2874118b59002efce9736c7.pdf
    • https://static.usrfiles.com/ugd/b8c837_58c7b4841bae4ed893488f877f87e318.pdf
    • https://static.usrfiles.com/ugd/b8c837_14cb80bdcb40485c9783e7d101722bf0.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_off00005f0a.bin
e66babdfa15c00152d0ce63a8dc6562bde1d6bc63424956a4b864273a5e10418
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0A 6292 bytes
font_01_sfnt_off0000748c.bin
d85839e0fd0300e112ce25772d0b124fb3884694b333ee98939eebb3daf5bcc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x748C 10576 bytes