Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e828d208666b02…

MALICIOUS

PDF

35.1 KB Created: 2020-09-18 10:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 702bab00669c173a1c23a5cc0b5ea86b SHA-1: b078b7e1702205a3014d3d2233b84e74680719f9 SHA-256: 20e828d208666b02b62c0b44ae2f35a10a728d8d748994ed20e672fdcbfeeff4
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 a URL that appears to be a lure for a worksheet answer key. The document body, though heavily obfuscated, contains the same URL. The PDF also exhibits characteristics of a link farm, with numerous embedded links, many of which point to benign-looking PDF files hosted on cloud storage, likely to mask the malicious redirector.

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=note+taking+worksheet+the+nature+of+science+answers
    • https://b20f87e8-b47c-4c57-87f9-5d369424735c.filesusr.com/ugd/90d19e_b3393f3314094152b8d0a3e51847af79.pdf?index=true
    • https://5a61d20a-2f72-4784-a29b-af6fbbcd6124.filesusr.com/ugd/c4dbd3_0b41b50bb4a64e85ba7f7345cbffb624.pdf?index=true
    • https://631a9c55-7efd-4fd1-81a6-206d873c5a52.filesusr.com/ugd/46a5ae_c858b9b3104a45b3add74595186e7007.pdf?index=true
    • https://6ffaf6d7-172d-4014-8dbb-820e0ddef042.filesusr.com/ugd/f35da0_ec14e2c92ea644c6a1875a4a53d4b1fd.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0435/7967/0689/files/mimulirusilebezofu.pdf
    • https://cdn.shopify.com/s/files/1/0484/0023/6704/files/king_triton_plush_doll.pdf
    • https://cdn.shopify.com/s/files/1/0437/7441/0909/files/39749619194.pdf
    • https://cdn.shopify.com/s/files/1/0434/1812/4445/files/5484160858.pdf
    • https://cdn.shopify.com/s/files/1/0441/1867/1512/files/alto_sax_sheet_music_free.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_off00004b01.bin
4c5fdacf3a107e12bbc07d1b840d9700a5ff97a496f6e797a6ad0e39d675054c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B01 5236 bytes
font_01_sfnt_off00005cef.bin
6f9fde13871fff24615db249b1269cac6e522d73caaf26b52507d6dff4b2dc92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CEF 10276 bytes

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