Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8726b919f8947e…

MALICIOUS

PDF

44.2 KB Created: 2020-09-07 10:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20654b0c505269d5de6bb0136e1a8eb5 SHA-1: 883e319ce74647f4f67bdc3d406e116d91c0055a SHA-256: bd8726b919f8947e5b516f3760715a0020a30e41ff1c85144dc72c108de3fa0f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=king+size+sheets+dimensions+uk'. This URL is likely used to redirect the user to a malicious site. The document body, though partially corrupted, also contains this URL, suggesting it's the primary lure. The file also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many pointing to Shopify domains, likely for SEO manipulation to increase visibility.

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.me/wix?keyword=king+size+sheets+dimensions+uk
    • https://static.usrfiles.com/ugd/e2a635_6c4c33e78fad40aeaabc9f736435dccb.pdf
    • https://static.usrfiles.com/ugd/daca0d_c843d9e294de4bc88b8b4a4b4e3603bc.pdf
    • https://static.usrfiles.com/ugd/8bc2a6_a23f75c1951f4dff9726306bb3f94f9d.pdf
    • https://static.usrfiles.com/ugd/97493d_7e4bd1e4bf9c42fea47dd1e83aefa982.pdf
    • https://cdn.shopify.com/s/files/1/0437/7142/9016/files/star_wars_galaxy_of_heroes_cheats_apk.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/minecraft_gta_5_servers.pdf
    • https://cdn.shopify.com/s/files/1/0432/8269/4312/files/vepiboninuramuwiwiw.pdf
    • https://cdn.shopify.com/s/files/1/0436/2777/4115/files/inflammatory_bowel_disease_diet.pdf
    • https://cdn.shopify.com/s/files/1/0440/7033/8725/files/bowuvojavipolibawujo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0762/2824/files/notedukobegutiwik.pdf
    • https://cdn.shopify.com/s/files/1/0444/3914/2566/files/61437308595.pdf
    • https://cdn.shopify.com/s/files/1/0434/8451/2406/files/7917192479.pdf
    • https://cdn.shopify.com/s/files/1/0432/8888/7460/files/coniugazione_verbo_lavare_forma_attiva.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000642a.bin
9dc4fad05b6f4da48c755fdf3248ed8d689f8d74ec1cf48095539bc00e8aa648
pdf-font-stream PDF embedded font (sfnt) at offset 0x642A 4868 bytes
font_01_sfnt_off00007494.bin
b0063ec8231f22a62df13c60b489c423a7af06258c6347ccf75d9bc8521dda6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7494 9748 bytes
font_02_sfnt_off000095e1.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x95E1 4324 bytes