Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3735da9495872be…

MALICIOUS

PDF

34.8 KB Created: 2020-09-02 16:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cec35c8a9fd2ed803481eed27c715e6c SHA-1: e38094191e3f8e73ac592fad3557e9beb65a817c SHA-256: d3735da9495872bef27a7cc7362b00ce8fc22a4c2160ed08c09b55bac381e6a3
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to product keywords and a URL that appears to be part of a link farm designed for SEO manipulation. The ML classifier also 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.me/wix?keyword=steve+madden+black+platform+ankle+boots
    • https://static.usrfiles.com/ugd/565485_33e6c1eaf32a4f92b1b8291d7df47d80.pdf
    • https://static.usrfiles.com/ugd/762c1a_3c0a148e1a2d4d38a5802590c456f2e0.pdf
    • https://static.usrfiles.com/ugd/f46427_e5042fcabdec4dc98644a0b35c1de04a.pdf
    • https://static.usrfiles.com/ugd/111c46_b6cc1dfed29840d9bd5ebc00d51f47d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce9bef7a5b524514a2015b534cdf4826.pdf
    • https://static.usrfiles.com/ugd/0df15e_e7e4b01c5cd847cb9b7644ab5a34d456.pdf
    • https://static.usrfiles.com/ugd/0e6328_a8376b3bcc4d4b6687aa79a2bceae752.pdf
    • https://static.usrfiles.com/ugd/5de1df_bd6e5a1958854dd9897ed7d7b1752bc9.pdf
    • https://static.usrfiles.com/ugd/8b49c6_5079da9ceb9c4cfc80add60551844421.pdf
    • https://cdn.shopify.com/s/files/1/0440/7610/5893/files/2010_chevrolet_impala_reviews_consumer_reports.pdf
    • https://cdn.shopify.com/s/files/1/0439/7203/4718/files/66978201130.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/naxusebos.pdf
    • https://cdn.shopify.com/s/files/1/0430/8857/6673/files/vofapafazivodexedugapo.pdf
    • https://cdn.shopify.com/s/files/1/0429/4203/8182/files/dowinol.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_off000040cf.bin
b3fb11f60bfb4b20e5eec9a6c6bec5457e88594c186a2c064ff5fd5c2e4184ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x40CF 5408 bytes
font_01_sfnt_off00005317.bin
a24508bce1c449bbec145b6484c0b3ec1e5784cb2768f538d5443454d4c38c6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5317 8712 bytes
font_02_sfnt_off00007053.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7053 4324 bytes