Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae58d44b40a87c9b…

MALICIOUS

PDF

66.8 KB Created: 2020-08-31 14:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ce8c11841abe51c7de4eb34f2863e50 SHA-1: 4472d1bf213190e48bc8dcc2097df4831977bf3f SHA-256: ae58d44b40a87c9b9c76a59bf908c61604ced0d8619b7da1c54e41a74e57b6ee
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly indicate a malicious intent to redirect users to harmful content. The ML classifier also flagged this PDF with high confidence.

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=2019+nfl+draft+qb+scouting+reports
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lafiku.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/zabojosigero.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9797/files/68588335408.pdf
    • https://cdn.shopify.com/s/files/1/0440/8298/7158/files/rexokupeziwufibame.pdf
    • https://cdn.shopify.com/s/files/1/0460/8691/4212/files/46632505215.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/depuwi.pdf
    • https://cdn.shopify.com/s/files/1/0438/4840/1046/files/mojegibiwaloxuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/9241/8468/files/26105253308.pdf
    • https://static.usrfiles.com/ugd/b8c837_24aea0c63e874923a51c64b47926ef78.pdf
    • https://static.usrfiles.com/ugd/34e21e_d19880ab4e1040c9bd7a189fa5f49943.pdf
    • https://static.usrfiles.com/ugd/b8c837_4e7b835acf0f44239cc725af5a94123b.pdf
    • https://static.usrfiles.com/ugd/9757e7_c185213442074d18ab9c589cd3590999.pdf
    • https://static.usrfiles.com/ugd/0a593f_63df55c90cf7406ea24fea147dd0e72b.pdf
    • https://static.usrfiles.com/ugd/b8c837_f577c71b25d34336a75ae439f6210a03.pdf
    • https://static.usrfiles.com/ugd/b8c837_e5a80f47e18540c9970a3db75374a0a2.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c60d.bin
ffc9ca2b4b2871f06c9d3dd636b8f99e00e9ce407a37ef3c6f2f7692e61095af
pdf-font-stream PDF embedded font (sfnt) at offset 0xC60D 5976 bytes
font_01_sfnt_off0000da62.bin
93af5abe5e9d1781471557a916f5b3bcee4024a8072134ebaf2cf85db78687c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA62 10424 bytes