Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d271b5538c9c6b5…

MALICIOUS

PDF

46.3 KB Created: 2020-09-05 16:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a30133549e258219c7e5947712a98dbb SHA-1: 1850b4a15caf8dbbdad89437fbcf4d17638db70c SHA-256: 6d271b5538c9c6b5da37b04a403c49b963eb9d3d49d35e84bd0e5e110011abb5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.link/pify?keyword=evidence+chain+of+custody+form+pdf, is identified as a malicious redirector. The document body, though obfuscated, also contains this URL, suggesting an attempt to direct users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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.link/pify?keyword=evidence+chain+of+custody+form+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/1871/4264/files/9564877477.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/gumez.pdf
    • https://cdn.shopify.com/s/files/1/0430/7927/0554/files/32627987422.pdf
    • https://cdn.shopify.com/s/files/1/0434/7543/5677/files/dagafuliza.pdf
    • https://cdn.shopify.com/s/files/1/0429/5337/5897/files/davudoxalifupogukisajon.pdf
    • https://cdn.shopify.com/s/files/1/0429/2119/7724/files/68547210306.pdf
    • https://cdn.shopify.com/s/files/1/0428/5664/4774/files/design_and_analysis_of_algorithms_ebook_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8165/4679/files/fokolutonifufetevotegirex.pdf
    • https://static.usrfiles.com/ugd/b8c837_dde8d2c32830414096a45273f73a64fa.pdf
    • https://static.usrfiles.com/ugd/ec0012_c98b5b14a8914716a2d63182e0729490.pdf
    • https://static.usrfiles.com/ugd/11276f_7abe6cb93121485e8f04350e2e641866.pdf
    • https://static.usrfiles.com/ugd/3b6424_cb09881c4e9a475686a05b58f0ed8463.pdf
    • https://static.usrfiles.com/ugd/b85eb0_8f48928dbd5c4f389dfa60a506dfbe9a.pdf
    • https://static.usrfiles.com/ugd/0bcf16_ecf298ef73fd4e638c8a66084d84e2bc.pdf
    • https://static.usrfiles.com/ugd/041b56_31442d99ef394dfea217576c008a8837.pdf
    • https://static.usrfiles.com/ugd/e745be_45ff5c4a91a84cb7b6557e1f10557a35.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a2f.bin
10e67a513219137a219342a6f77af2d3f8649bf857cc936366937a1395a8647e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A2F 5364 bytes
font_01_sfnt_off00007c46.bin
fef93b00a1b8047bd8f5f6dc0ad06839d8829f19efc95bfdd2ad8825f2848255		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C46 9964 bytes
font_02_sfnt_off00009e38.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E38 4324 bytes

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