Malicious PDF — malware analysis report

Static analysis result for SHA-256 de96a05d58c34a5d…

MALICIOUS

PDF

47.3 KB Created: 2020-08-31 01:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8d3fef31dcf206ff87dcfb30ff485fd SHA-1: 638a7e2e49ebd564db4f3147d398e5bc9a450408 SHA-256: de96a05d58c34a5d36b017a328a0b3733ccb6554d334bfef922ba1ca5ceea91c
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/wix?keyword=mod+shadow+of+mordor, which is likely the initial lure. The presence of numerous links to static.usrfiles.com suggests a link farm used to distribute the malicious content.

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.cc/wix?keyword=mod+shadow+of+mordor
    • https://static.usrfiles.com/ugd/173616_13b0b33eefd64172800be0bc6e07bd4c.pdf
    • https://static.usrfiles.com/ugd/e7e4a0_c69cd11ab9fc4ed4b13de0f5f4bcdc27.pdf
    • https://static.usrfiles.com/ugd/ae15ca_c5eee02160e14e91a1c82945de8adda2.pdf
    • https://cdn.shopify.com/s/files/1/0434/3159/2092/files/bawidenuxepumugixa.pdf
    • https://cdn.shopify.com/s/files/1/0440/9756/8920/files/14610938412.pdf
    • https://cdn.shopify.com/s/files/1/0428/4914/0902/files/bumovisanonamabatenuloja.pdf
    • https://static.usrfiles.com/ugd/eed56f_4c6570ceeaed4717a6a76fb54702145d.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e92215b4e45415382f634a0c6f2f504.pdf
    • https://static.usrfiles.com/ugd/173616_c6f8c46b292b40fc876e6826b68a2de4.pdf
    • https://static.usrfiles.com/ugd/c836c3_f03b03d0047d45df9e3be93e94d53990.pdf
    • https://static.usrfiles.com/ugd/77eba6_5d1b3ce60cce49b982066f8701e4ba16.pdf
    • https://cdn.shopify.com/s/files/1/0432/3573/7764/files/30417028904.pdf
    • https://cdn.shopify.com/s/files/1/0437/5930/4858/files/54079785347.pdf
    • https://cdn.shopify.com/s/files/1/0434/6085/3912/files/47481802770.pdf
    • https://cdn.shopify.com/s/files/1/0435/5129/3603/files/zivatukuwatusaluk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e71.bin
06ff7f6e05830b107c48ed7d92094849a27e21b6079368ba044cc151fbb56d83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E71 4648 bytes
font_01_sfnt_off00007e40.bin
189b30fc691c916cac6a123ad558dde5f5f36e59f7a9650419e5dc2a3dac8f00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E40 10592 bytes
font_02_sfnt_off0000a27b.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA27B 4324 bytes

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