Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf60d8755a61301b…

MALICIOUS

PDF

39.1 KB Created: 2020-08-29 09:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de9e617cf40cc543790b16ef7aa805ee SHA-1: 872e4da6a549301fc54d55d01af8c60a4a4d3d2e SHA-256: bf60d8755a61301bc636559108c18b650db8dc296cabd2e7e60eeee13c6ee2e4
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that triggered the redirector heuristic. This suggests the document's primary purpose is to lure users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=delta+6+professional+jointer+37-196
    • https://static.usrfiles.com/ugd/b8c837_004b04228d004325abd11dc9426fcc80.pdf
    • https://static.usrfiles.com/ugd/b8c837_2abca645f0c7424a96539370076e6bf3.pdf
    • https://static.usrfiles.com/ugd/b8c837_5d874fdff0444ab6a2898bc7ca32f4a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_b508ac2e86d046f5b0078f3fef4526a2.pdf
    • https://static.usrfiles.com/ugd/b8c837_1419705ab4874e0bac4a3c4176785338.pdf
    • https://cdn.shopify.com/s/files/1/0438/2670/8640/files/comcast_channel_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/9452/4579/files/22872216893.pdf
    • https://cdn.shopify.com/s/files/1/0461/8993/6798/files/corner_bookmark_template_printable.pdf
    • https://cdn.shopify.com/s/files/1/0433/6176/3480/files/wivikuzafodawa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/55742160690.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_off000057ec.bin
d06382e43fb95035905527d334895e34d9bdfed3fa4412bfd3c0a1766ac3b549		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57EC 5608 bytes
font_01_sfnt_off00006b20.bin
12a2d20a2b53cd2427dc2f49777d3f6fc129fd04bc4d2979d7e6432214df4349		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B20 10724 bytes

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