Malicious PDF — malware analysis report

Static analysis result for SHA-256 09befbaec1b74e2a…

MALICIOUS

PDF

40.7 KB Created: 2020-08-31 01:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d87cf72c23fbf4d90d14f7912ed04fd SHA-1: a02c8cb07c022548fb30a6cdbbcf5d4fd8857da4 SHA-256: 09befbaec1b74e2a718a52a080471ac5f57d1c9977837786b566d7f44c02c40f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on Shopify and other platforms, suggesting a link farm for SEO manipulation or to host malicious content. One critical heuristic identified a link to a known malicious redirector, and another heuristic indicated a lure to install a browser extension or update. While no scripts were explicitly extracted, the presence of numerous links and the social engineering lure strongly suggest an attempt to trick the user into downloading and executing further malicious content or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=guitar+tab+white+pages+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1174/2628/files/pakozotigofixuwoxodokel.pdf
    • https://cdn.shopify.com/s/files/1/0437/3859/5482/files/muroboned.pdf
    • https://cdn.shopify.com/s/files/1/0433/7719/7221/files/astro_first_hantu_kak_limah.pdf
    • https://cdn.shopify.com/s/files/1/0434/1537/1932/files/vegolijavivefozu.pdf
    • https://static.usrfiles.com/ugd/b8c837_e5d6b7df37384fc9a880e88f05fb19f3.pdf
    • https://static.usrfiles.com/ugd/b5472a_1419ce037f6847e682e91984cc722902.pdf
    • https://cdn.shopify.com/s/files/1/0439/2399/6840/files/nodinifazomifabisapuwo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2220/5607/files/adobe_flash_player_version_11._4_free.pdf
    • https://cdn.shopify.com/s/files/1/0465/3986/6270/files/all_dj_manish_song.pdf
    • https://static.usrfiles.com/ugd/b8c837_0063d0cf51e140d7bd04ad652ac32610.pdf
    • https://static.usrfiles.com/ugd/b8c837_10c490bdd8774643ac54b12024c3efec.pdf
    • https://static.usrfiles.com/ugd/b8c837_650183f1d51f413196dcc08892f593b3.pdf
    • https://static.usrfiles.com/ugd/b8c837_20d82a16a88e4f5791e57b7def2b1a52.pdf
    • https://static.usrfiles.com/ugd/e2c250_f7c6b13fd4914bcc97089514ae140fa0.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_off00006142.bin
08008ee2591054564d2fd4788c25255eec046165b1e77a813190f56af6dfe596		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6142 5536 bytes
font_01_sfnt_off00007425.bin
cda77aed321b040083086ecb67ff19d20e2d5e1b2dd10c58412810df41e6bba7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7425 9952 bytes

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