Malicious PDF — malware analysis report

Static analysis result for SHA-256 47ddc04fee67d41c…

MALICIOUS

PDF

42.4 KB Created: 2020-08-30 02:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c56929c498044de35c141c55d98c5b26 SHA-1: a6623d4198379a61d5676cdb2d67de4aaeb18d28 SHA-256: 47ddc04fee67d41c6e744b745ea6ad826e91f0e28cf0493f8a8594dac157140c
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the primary redirector URL and numerous other PDF links, suggesting a lure to external, potentially malicious, content.

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.cc/wix?keyword=reinforced+masonry+engineering+handb
    • https://cdn.shopify.com/s/files/1/0431/5004/9446/files/american_girl_collecting.pdf
    • https://cdn.shopify.com/s/files/1/0431/6240/2965/files/adobe_photoshop_7._0_tutorials_in_tamil_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/7430/4662/files/nafidifikikisijun.pdf
    • https://cdn.shopify.com/s/files/1/0436/1306/1277/files/munetaduvaronakuzamefexo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/mirajex.pdf
    • https://cdn.shopify.com/s/files/1/0447/8818/7293/files/92_country_code.pdf
    • https://cdn.shopify.com/s/files/1/0429/7372/4825/files/59242152324.pdf
    • https://cdn.shopify.com/s/files/1/0436/0326/3650/files/stuart_wilde_books.pdf
    • https://cdn.shopify.com/s/files/1/0435/8311/1323/files/rofinalarukatofowalugufeg.pdf
    • https://static.usrfiles.com/ugd/162fe6_942c37923c19450fb29d73f914111b65.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6749ae73bce4fd8b2c312012ea23b8c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c44405b3f47f411096c8036deed1dd57.pdf
    • https://static.usrfiles.com/ugd/d54300_b30cb0daf7b74c2780278a90de072d0a.pdf
    • https://static.usrfiles.com/ugd/451461_2eecb87b88ee475ea4b762b0eee93ea6.pdf
    • https://static.usrfiles.com/ugd/79cb75_d41e19a4d5a541f3a4785fd68ab1dca2.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_off000064f2.bin
275d6411176c11f2b69cb2819111abfcf21255cac721e31ea33ac55ee7102a9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x64F2 5652 bytes
font_01_sfnt_off00007803.bin
55d4ffd9b1973c38e2761d26d0f79fa4220bee63dd6ff4616ef9ffeb1811840d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7803 11252 bytes