Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ef55c7896b7ae6…

MALICIOUS

PDF

40.1 KB Created: 2020-08-19 17:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed563eb54162ecd87906c8b14a150822 SHA-1: 0acb3ed3cdde3ba4c6074851ccad6d7627ec1353 SHA-256: 11ef55c7896b7ae60020778930676ca1fd8714f273f24157161a89df5c05c6c2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for malicious redirector links, specifically pointing to 'ttraff.com'. The document body also contains the same URL, which promises free software ('carbon copy cloner free mac') to entice users to click. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm designed to distribute malicious content or engage in SEO manipulation. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=carbon+copy+cloner++free+mac
    • http://kulamako.sabinejewelry.com/uploads/1/3/1/6/131607407/mabipug.pdf
    • http://files.tedxunionvillehs.com/uploads/1/3/0/7/130740480/662c2982.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/22822089075.pdf
    • https://cdn.shopify.com/s/files/1/0435/9775/8622/files/vitamina_d_alimentos.pdf
    • https://cdn.shopify.com/s/files/1/0429/6392/7206/files/bimajomitatitexo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51906755497.pdf
    • https://cdn.shopify.com/s/files/1/0430/5689/0013/files/xijojujepo.pdf
    • https://cdn.shopify.com/s/files/1/0438/2900/2390/files/9554626850.pdf
    • https://cdn.shopify.com/s/files/1/0446/7389/2515/files/c_web_browser_open_file.pdf
    • https://cdn.shopify.com/s/files/1/0434/0596/7514/files/dg_a_b_c_d_checks.pdf
    • https://cdn.shopify.com/s/files/1/0435/6410/5886/files/arbor_acres_plus_broiler_performance.pdf
    • https://cdn.shopify.com/s/files/1/0435/1541/2632/files/wakezugudi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6576/1176/files/tulubirorimer.pdf
    • https://cdn.shopify.com/s/files/1/0429/5540/7511/files/20416364969.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_off00005e49.bin
5624916a9759814932cd75ead8561c11b2db5f531837a81f559e333e00c2512d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E49 5132 bytes
font_01_sfnt_off00006fad.bin
2906020515d7e9b409142c9660033b1328c00e46247db2ec6815b1a65a446f38
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FAD 10580 bytes