Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ed581a997fa122…

MALICIOUS

PDF

39.0 KB Created: 2020-09-02 12:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d08161817fe7652597de413878d6781 SHA-1: 85e98c49ba06d18f680db1fcff08ebb0d123af13 SHA-256: 43ed581a997fa1228418fccadc992c575fa2868afeaed34aaef7fd2d13f8b2fd
128 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'Tnusrb exam hall ticket 2019' and a call-to-action phrase, suggesting a social engineering lure. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external links, further supporting the malicious intent of directing users to external, potentially harmful, content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=tnusrb+exam+hall+ticket++2019
    • https://static.usrfiles.com/ugd/b8c837_60117dac7607460884c8cc948294237b.pdf
    • https://static.usrfiles.com/ugd/fb5067_61c3a8f68ac440ab9a16e59c025b1d57.pdf
    • https://static.usrfiles.com/ugd/a3b54b_a4b160d6724f4e448ae9cee95f9f700a.pdf
    • https://static.usrfiles.com/ugd/b4609a_5767aaac97a8416e8d5eb4a21113f6a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_47cf9e6eac244b3f9003590006603f2f.pdf
    • https://static.usrfiles.com/ugd/576447_b20b3fdb182f4832a0541764ecf8ec64.pdf
    • https://cdn.shopify.com/s/files/1/0432/8056/4392/files/capotia_crafting_guide.pdf
    • https://cdn.shopify.com/s/files/1/0462/3918/7104/files/sephora_employee_handbook.pdf
    • https://static.usrfiles.com/ugd/221f3a_ee86a65c66464286b0c24dea3d723467.pdf
    • https://static.usrfiles.com/ugd/e4d7df_df1c1ce7d440406aa4638fbc33c2aa59.pdf
    • https://static.usrfiles.com/ugd/cc1a03_fc041dc5bd71479c9449b2719869e5af.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_off00005917.bin
64370453d70259f16c5a2ef994b734e8be5b4cfb80d458179b3d19d4463d6790		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5917 5744 bytes
font_01_sfnt_off00006c75.bin
e89639ccb5c27ae4c4f8df07e578c1cfdbf1892e1440733e3accf31cb5adaf03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C75 10400 bytes

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