Malicious PDF — malware analysis report

Static analysis result for SHA-256 562e3e3ff86f7253…

MALICIOUS

PDF

47.6 KB Created: 2020-08-31 02:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 172c31e16335c4ce41532c245c71d5f2 SHA-1: 19d5d712f89187eae7a27def3a147fed7fe45a43 SHA-256: 562e3e3ff86f7253ac394856fcc509cd386f103dcdaf2842c5fae73e3abc1951
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. This indicates the document's primary purpose is to lure users to a potentially harmful external site. The presence of a large number of embedded links, many hosted on 'static.usrfiles.com', further supports the idea of a link farm designed for SEO manipulation or distributing malicious content. 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.cc/wix?keyword=bounding+box+outline+reloaded
    • https://static.usrfiles.com/ugd/b8c837_2ce72346cd694760acce3098d6655ab0.pdf
    • https://static.usrfiles.com/ugd/8dde66_fc03e04c6ebf4b4c952a70210d2e066b.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c52407394504aaeba3a17284267aed0.pdf
    • https://cdn.shopify.com/s/files/1/0432/2911/8627/files/biogaia_gotas_dosis.pdf
    • https://cdn.shopify.com/s/files/1/0431/8868/2916/files/debosepibajipuxa.pdf
    • https://cdn.shopify.com/s/files/1/0432/5464/4894/files/45863547893.pdf
    • https://cdn.shopify.com/s/files/1/0450/7585/7571/files/meraxokosogamavajev.pdf
    • https://cdn.shopify.com/s/files/1/0437/1900/0229/files/reliability_data_analysis_with_minitab.pdf
    • https://cdn.shopify.com/s/files/1/0437/0956/3035/files/35111880903.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f7374e4ddc74456af9432fd1a30e279.pdf
    • https://static.usrfiles.com/ugd/7f16bd_aba5f5c8189e4b4a978426d72a5e085c.pdf
    • https://static.usrfiles.com/ugd/b13fd1_05d991b0388341078478d6c5b9c4a65b.pdf
    • https://static.usrfiles.com/ugd/1fa6dd_aa4d6576bc674334af56afb8e132108b.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_off00006e8e.bin
d7f813ce4f16a1c5a08a60e5e10dd1bed60e1f0406e9833c0f336aa4cbd3458c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8E 5072 bytes
font_01_sfnt_off00007fda.bin
b577e5238364536d4e62839244be21af2358b4676326c18e142c1cf1bdcd2d61
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FDA 15508 bytes