Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf6d345aaffce48…

MALICIOUS

PDF

44.6 KB Created: 2020-08-31 05:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd6f3b77beac7976159d84247ba14666 SHA-1: b8fa016b9c2ee180812c7243198ca7f9b6635c3f SHA-256: ddf6d345aaffce4868398f3a438426fce1f352bea0d451b6b53cd19cd7d5956e
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a large number of embedded links, many pointing to a link farm. One of the primary links, https://ttraff.com/wix?keyword=pushpavanam+kuppusamy+ayyappan+songs, is associated with known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting a lure or redirection mechanism.

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.com/wix?keyword=pushpavanam+kuppusamy+ayyappan+songs
    • https://static.usrfiles.com/ugd/b8c837_916e44f6fad5480fa1539ac33117e80c.pdf
    • https://static.usrfiles.com/ugd/b65acf_7a1dab8483f04bea83191e6c2e9b493b.pdf
    • https://static.usrfiles.com/ugd/99a8f2_4d9e83aeb6274d8ea163b49d3a5552a2.pdf
    • https://static.usrfiles.com/ugd/b8c837_abe97db8667f451eb4f9fc76bc0e7710.pdf
    • https://static.usrfiles.com/ugd/b8c837_0875eb0304ff4d1c9568b40c750db291.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ea50097fd1344778fc09c232cb3b066.pdf
    • https://static.usrfiles.com/ugd/d17951_fd1cd35a768c4d96957540a50c9c6820.pdf
    • https://static.usrfiles.com/ugd/b8c837_e027e159079b4864815ff3ad355f9773.pdf
    • https://static.usrfiles.com/ugd/b8c837_15b571ccc55447868505cbab9e834b35.pdf
    • https://static.usrfiles.com/ugd/345929_9849ef20b03c4fac86b8343cb6316105.pdf
    • https://cdn.shopify.com/s/files/1/0449/4488/3880/files/angina_de_ludwig_en_nios.pdf
    • https://cdn.shopify.com/s/files/1/0431/4998/3901/files/calendar_january_2020_printable.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/85484739365.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_off00005403.bin
8b7d689705e9bc22631e84ce7ab98cf65bc722121767c848b29ecd8fc251e017
pdf-font-stream PDF embedded font (sfnt) at offset 0x5403 5332 bytes
font_01_sfnt_off0000660a.bin
bf06a8d0b703292252ff03e26785c656acbb1b722f1ea83c45d0a066d6a65424
pdf-font-stream PDF embedded font (sfnt) at offset 0x660A 8276 bytes
font_02_sfnt_off00007cc6.bin
5ca66bda7691aa1cc5820ee69fca320c235a2d32884d06562e0476702516973c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC6 12776 bytes