Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b595cd7b4ef65ba…

MALICIOUS

PDF

42.7 KB Created: 2020-08-21 15:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d1db8a7de368d5bde386ff93a09ce24 SHA-1: b75c7f41e09ed53f1989720c66bbf310cf1bc2df SHA-256: 3b595cd7b4ef65bad8f6933bbaf391bc03e70af8c2455ccc13f283c0c6b60e33
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=first+week+kindergarten+worksheets', is designed to redirect users to malicious content. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDFs, many hosted on Shopify. The ML classifier strongly indicates maliciousness.

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.cc/pify?keyword=first+week+kindergarten+worksheets
    • http://vivezaji.rbef.tv/uploads/1/3/1/3/131398140/nekibu-xijapavujatot-gevuvix-wilefif.pdf
    • http://files.helioshk.com/uploads/1/3/0/9/130969708/2a3d4a.pdf
    • https://cdn.shopify.com/s/files/1/0431/3851/5098/files/xufabajasalarutu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7395/3187/files/toyota_corolla_2020_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/4228/2394/files/mopomofekulofupasenulive.pdf
    • https://cdn.shopify.com/s/files/1/0435/8832/1435/files/lakara.pdf
    • https://cdn.shopify.com/s/files/1/0434/5495/5672/files/45949337750.pdf
    • https://cdn.shopify.com/s/files/1/0431/3966/1986/files/pawij.pdf
    • https://cdn.shopify.com/s/files/1/0451/1966/8377/files/vitubatixijajuvinudesov.pdf
    • https://cdn.shopify.com/s/files/1/0432/4609/2443/files/dagulipu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1016/9759/files/49917102732.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/tic_tac_toe_javafx.pdf
    • https://cdn.shopify.com/s/files/1/0431/4421/6727/files/21050081648.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_off00006891.bin
aff62b56c0902f99dcb8699a9032e0ee68386e16c810414652b9191b8f25ff61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6891 5168 bytes
font_01_sfnt_off00007a2f.bin
4e36c23dc6b8ca9c0c19b0b68822d85272b64624de8715ea4dfe500c8a3b8e28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A2F 10472 bytes

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