Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf72fed5f8acfc46…

MALICIOUS

PDF

39.6 KB Created: 2020-08-29 02:40:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b60935555d7061f460ccf248c1acb128 SHA-1: 7f35b36ce6d5ee82e7a70a655dc5ab547c4ed5ba SHA-256: bf72fed5f8acfc46d84dcafd4d3887d17ca2a525b51f30368eff049cde0401fa
150 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 'https://ttraff.ru/wix?keyword=descargar+libro+los+renglones+torcid'. This URL is presented within the document body, disguised as a book download. The file also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify domains, likely for SEO manipulation or to host further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.ru/wix?keyword=descargar+libro+los+renglones+torcid
    • https://static.usrfiles.com/ugd/b8c837_33906e7b17164d1da9613f6d42afb0ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_439ca287ba404a629e4fd1e99a16ca19.pdf
    • https://static.usrfiles.com/ugd/b8c837_c40b7f75d40843f795fd81b4eabcf8ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_720cf148b16b4f96a9dd0308104a43b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_160e3d8482a844458b9323f604b162d4.pdf
    • https://cdn.shopify.com/s/files/1/0449/3508/6248/files/level_11_94_percent_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/9128/7461/files/android_command_line_tools.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/fevoguxotaw.pdf
    • https://cdn.shopify.com/s/files/1/0440/8701/7637/files/docs._jboss._org_hibernate.pdf
    • https://cdn.shopify.com/s/files/1/0432/2128/7080/files/16197721433.pdf
    • https://cdn.shopify.com/s/files/1/0435/2966/6724/files/27578950329.pdf
    • https://cdn.shopify.com/s/files/1/0437/1379/0106/files/validity_and_reliability_in_research_methods.pdf
    • https://cdn.shopify.com/s/files/1/0457/8118/8764/files/forming_plural_nouns_worksheet_for_grade_2.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_off00005a94.bin
53ae390115b63aa645c9e8bb2161fc7d8c714c2e27f3b19650e0c7d3272c6a5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A94 5248 bytes
font_01_sfnt_off00006c6b.bin
9639eeca247367d74a3d96c11fe3ca54fad070c837bffc5c3706c7780bc118e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C6B 11396 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.