Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83961c33da85804…

MALICIOUS

PDF

51.2 KB Created: 2020-08-31 05:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1b1eaafb988ebfcd9acd5992feb2f17 SHA-1: 81d29ca666d3367ac394ddc9d732d35059384b29 SHA-256: e83961c33da8580491fa0163f40ae01a0d4879adc6f5429dd4b0bf63c8f48ffc
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a link farm with numerous external PDF links. One of these links, 'https://ttraff.ru/wix?keyword=thidwick+the+big-hearted+moose+pdf', is identified as a known malicious redirector. The document body appears to be malformed but contains the malicious URL. The presence of a link farm and a malicious redirector suggests an attempt to lure users to a compromised or malicious site.

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=thidwick+the+big-hearted+moose+pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/toro_recycler_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/68920979717.pdf
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/34328124947.pdf
    • https://cdn.shopify.com/s/files/1/0430/0744/3103/files/nidosam.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa60f998f3ca46a0a3a5118adb8edc6e.pdf
    • https://static.usrfiles.com/ugd/b65acf_f5eb35a184624c6c8bb99a154340bb95.pdf
    • https://cdn.shopify.com/s/files/1/0433/4993/4231/files/64262599657.pdf
    • https://cdn.shopify.com/s/files/1/0435/8216/1053/files/absorcion_de_vitaminas_hidrosolubles_y_liposolubles.pdf
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/english_speaking_course_free_download_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8632/2600/files/the_tipping_point_drive.pdf
    • https://cdn.shopify.com/s/files/1/0435/4100/4439/files/74320084141.pdf
    • https://cdn.shopify.com/s/files/1/0430/1471/7599/files/54748988968.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/34163526062.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_off00008929.bin
415db253a4a4239d3c1cdac5ea1b1618025336dea4824ad504467861193656af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8929 5816 bytes
font_01_sfnt_off00009cde.bin
bd5a9a3d9dc86c40bab961ca5babbc267ce4d48e4c37f12ca22cb207873a1e99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CDE 10204 bytes

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