Malicious PDF — malware analysis report

Static analysis result for SHA-256 81102fe563f2fd3d…

MALICIOUS

PDF

42.3 KB Created: 2020-09-07 22:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7da656e0b3d932ca361d18cff1033c8c SHA-1: 66941732233783c096504300d4caf3adbd6b2dd6 SHA-256: 81102fe563f2fd3d99a6bf553172d8e0dbca4dcd927931975272f1f72d8f4ebd
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'adjective forming suffixes pdf' and includes the malicious redirector URL. This suggests the document is designed to trick users into visiting a malicious site.

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.link/wix?keyword=adjective+forming+suffixes+pdf
    • https://static.usrfiles.com/ugd/24deb6_53f051d7c8e84caab479d45a232a3968.pdf
    • https://static.usrfiles.com/ugd/b8c837_121f57f7445a4b548cddd94bf27bbc0d.pdf
    • https://static.usrfiles.com/ugd/0cd3a8_0555b628e30f4994b56dec0d4c077230.pdf
    • https://static.usrfiles.com/ugd/48f461_78e9671fe08e4f5f99681d231033c349.pdf
    • https://static.usrfiles.com/ugd/9bd8c3_3d8444f7940d47bcaf369aa59fb8175c.pdf
    • https://cdn.shopify.com/s/files/1/0431/2272/0922/files/32694815045.pdf
    • https://cdn.shopify.com/s/files/1/0435/9208/9759/files/campanilla_criminal_law_reviewer_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/3810/6023/files/rabazabope.pdf
    • https://cdn.shopify.com/s/files/1/0429/6340/2905/files/difference_between_bioreactor_and_fermentor.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67331216746.pdf
    • https://static.usrfiles.com/ugd/9ea91e_a20b25b23ce84aa686d965069c70d313.pdf
    • https://static.usrfiles.com/ugd/f1780b_22268368aebf40c5a8f810c98a1e687b.pdf
    • https://static.usrfiles.com/ugd/3c8574_5d18a757c4774046936ab963e2ab6333.pdf
    • https://static.usrfiles.com/ugd/97368a_3d685c8de3d8422a8ee1746597fe6d30.pdf
    • https://static.usrfiles.com/ugd/24d943_e420fb3b130e46b8b116a0114d4e69c2.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_off0000678d.bin
5b09974b9a05e5bc32b4847b85bca4a8e4b28af49dc5f6c5b5600d32b9720aa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x678D 5424 bytes
font_01_sfnt_off00007a0a.bin
aa0c49c6bde3cf7175692b1a146585a18a1ec949e4e13abdb264624d8aa0220a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A0A 10172 bytes

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