Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c32d78790efca48…

MALICIOUS

PDF

46.9 KB Created: 2020-08-31 05:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b2eae0a77ebb9f23170a0218103b04b SHA-1: 40a0e4793e778c29e75cc8e8b03ec5b4ff438098 SHA-256: 2c32d78790efca48235e16f598d9cda9bbff82039661ed0bec60bf1ff0211846
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm designed to attract search engine traffic and potentially lure users to malicious content. The ML classifier also strongly indicated maliciousness.

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=the+changing+light+at+sandover+pdf
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/kefebusex.pdf
    • https://cdn.shopify.com/s/files/1/0435/0499/2408/files/osrs_recipe_for_disaster_lumbridge_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/5757/0207/files/wosivaguxomidenatup.pdf
    • https://static.usrfiles.com/ugd/9e53d4_7c8be268fdd94247aac9d27596cc23e3.pdf
    • https://static.usrfiles.com/ugd/9757e7_1d771f4f1f4645c5acf7988aa8487e04.pdf
    • https://static.usrfiles.com/ugd/a91264_b3f73dd4a6614a6ab574c2b0ba2b2284.pdf
    • https://static.usrfiles.com/ugd/b8c837_c02035af460e4bfc92c6e51eb577c4a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_da1b8b8407d442d7998881b1a0444216.pdf
    • https://static.usrfiles.com/ugd/badafb_95a14bcac19b4b848ed90365212a59e3.pdf
    • https://static.usrfiles.com/ugd/8127dd_92213bb03563444db3b7532c01bc16b0.pdf
    • https://static.usrfiles.com/ugd/7dd30d_8a6fae9c9fa64f3499acaf0107579dda.pdf
    • https://static.usrfiles.com/ugd/b8c837_04b691418b70453aa3f836a0939145b7.pdf
    • https://static.usrfiles.com/ugd/ce5d00_41016b44a7e44302924b34032cc0bd66.pdf
    • https://static.usrfiles.com/ugd/136d07_217623d1660f4cfb97abf773f79acd6c.pdf
    • https://static.usrfiles.com/ugd/3b7182_79fdfa2ac271463e80952fcddcaa18a0.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_off000079d9.bin
d4c9d9e0f81e7b163d6d761cc2c118124154a5f57b24c69236759b8cfc27893b
pdf-font-stream PDF embedded font (sfnt) at offset 0x79D9 5424 bytes
font_01_sfnt_off00008c48.bin
c056e7805fa2bd5ce23913cf0ba66e6c20d4cd2fdbab872605fa2bff52a70851
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C48 10120 bytes