Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0c38cfa6b570ef…

MALICIOUS

PDF

41.1 KB Created: 2020-07-27 17:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7562fd23266b55ef59dca430da8239f4 SHA-1: 3f94b439fab404925cdf4eac93bb7b3148483057 SHA-256: bf0c38cfa6b570ef5039b01f6eb970c84104febd1c6b1d687ce15bad068221e5
120 Risk Score

Malware Insights

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

The PDF file contains numerous links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to educational worksheets. The presence of embedded links and the redirector indicate an attempt to lead the user to malicious content, likely for further exploitation or credential harvesting.

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.com/pify?keyword=blends+and+digraphs+worksheets+2nd+grade
    • http://files.chesapeakemobile.com/uploads/1/3/1/0/131071056/zutudagup.pdf
    • http://files.cheekyupstart.co.nz/uploads/1/3/1/3/131378771/gafun-xudemijofin-sukibi.pdf
    • http://files.redwoodvisualarts.org/uploads/1/3/1/8/131856430/voladoveviz-tokoxeji.pdf
    • http://files.barehandscrossfit.com/uploads/1/3/1/3/131398091/9381698.pdf
    • http://files.wefightforfood.com/uploads/1/3/0/7/130776536/37a25b55656aa7.pdf
    • http://files.wefightforfood.com/uploads/1/3/0/7/13
    • https://cdn.shopify.com/s/files/1/0438/5823/1461/files/mesose.pdf
    • https://cdn.shopify.com/s/files/1/0429/0999/1075/files/51681675735.pdf
    • https://cdn.shopify.com/s/files/1/0427/5830/8006/files/vizuve.pdf
    • https://cdn.shopify.com/s/files/1/0435/1816/5146/files/begipiwite.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/13352720754.pdf
    • https://cdn.shopify.com/s/files/1/0432/8760/9497/files/mutolujipixur.pdf
    • https://cdn.shopify.com/s/files/1/0431/8350/5570/files/4257479328.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77330784460.pdf
    • https://cdn.shopify.com/s/files/1/0431/5178/6135/files/96695868056.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_off000062d5.bin
101872011f22bc5854e2b80700803b8b5094428a0fc2c0b0354fc05fadf8091f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D5 5344 bytes
font_01_sfnt_off0000750b.bin
5d51a75ffa41efe04892546c9df15778a4266bbefab03c4986950d9004541bd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x750B 10008 bytes

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