Malicious PDF — malware analysis report

Static analysis result for SHA-256 98439c15cebc7fae…

MALICIOUS

PDF

50.1 KB Created: 2020-09-06 11:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 967cc19a46d3f20d484299b0feb59696 SHA-1: 77d054559df48f5b9c2ebdef2fbf4ddb0412b861 SHA-256: 98439c15cebc7faec0cbfd16b6bb88b90c0d7f91f54091349156027a1265898f
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=barium+meal+radiology+pdf'. This URL is presented within the document body, disguised as a radiology PDF. The file also contains a PDF link farm heuristic, indicating a large number of outbound links, many of which point to benign Shopify domains but one critical link to the malicious redirector. The presence of multiple embedded URLs and the specific lure text suggest a phishing attempt to redirect users to malicious infrastructure.

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.club/wix?keyword=barium+meal+radiology+pdf
    • https://static.usrfiles.com/ugd/b8c837_cbe712cf79044c0db5f095efe17b8408.pdf
    • https://static.usrfiles.com/ugd/1be480_6647f057ef3747a28532f770eae10cf8.pdf
    • https://static.usrfiles.com/ugd/3b47cb_8b9017a3a72f4efa85144a04357f92bb.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_68657c0358144438ac2c27db3044838b.pdf
    • https://cdn.shopify.com/s/files/1/0433/0140/4830/files/sotewagavij.pdf
    • https://cdn.shopify.com/s/files/1/0451/0308/7769/files/74309651021.pdf
    • https://cdn.shopify.com/s/files/1/0430/7759/9383/files/walden_thoreau_deutsch.pdf
    • https://cdn.shopify.com/s/files/1/0431/1246/4535/files/digestive_system_worksheet_printable.pdf
    • https://cdn.shopify.com/s/files/1/0435/4329/8207/files/woronaligora.pdf
    • https://cdn.shopify.com/s/files/1/0434/3998/0710/files/22863800063.pdf
    • https://cdn.shopify.com/s/files/1/0438/2749/5072/files/fax_cover_sheet_template_confidentiality_statement.pdf
    • https://cdn.shopify.com/s/files/1/0433/8994/3971/files/notepad_for_android_free_apk.pdf
    • https://cdn.shopify.com/s/files/1/0431/2157/4049/files/football_performance_analyst_salary_uk.pdf
    • https://cdn.shopify.com/s/files/1/0435/7298/6014/files/smart_goals_for_students_worksheet.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_off00008248.bin
a6f90ab1bb2798f5189833ab643c34e8a02ada52ea600e750b64dd412bcee8a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8248 5332 bytes
font_01_sfnt_off00009461.bin
0966d6ef24e10c94539daaf0fa25b0ae333a768f701206828a45c81b484e2589		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9461 12128 bytes

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