Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1e3b88aa6d9a9e…

MALICIOUS

PDF

52.5 KB Created: 2020-08-30 12:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c989027d18ad5d7c6f0abde3f24b34d0 SHA-1: 154e50be6562f6f99c49e7051c05e719546cafdc SHA-256: fb1e3b88aa6d9a9ecb475c5a89844e107b3eda8f73d5dc5d4c2e9b632553fabe
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a PDF link farm. One of these links, 'https://ttraff.ru/wix?keyword=the+reading+strategies+book+by+jenni', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the same URLs, suggesting a coordinated effort to redirect users.

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=the+reading+strategies+book+by+jenni
    • https://static.usrfiles.com/ugd/ce0e6d_b849d28d5ba045baa19a1fe7eda0e947.pdf
    • https://static.usrfiles.com/ugd/857e61_3049abbe971e440989887bf121804289.pdf
    • https://static.usrfiles.com/ugd/b8c837_81dc683b970c48aca77afce710b8cbcd.pdf
    • https://static.usrfiles.com/ugd/565485_850010900ba34bb29e654280a7e3c198.pdf
    • https://static.usrfiles.com/ugd/b8c837_e78df294ef654ab2b940ce7421fba450.pdf
    • https://static.usrfiles.com/ugd/b8c837_192c92c0d559484dac893d6c930670a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_44121cb3184d4762b3b64512f465a8bb.pdf
    • https://static.usrfiles.com/ugd/36f25b_341a8743593d4ac7899c546eb0b1ec1e.pdf
    • https://static.usrfiles.com/ugd/4f270c_42dda3433b974ec1a492256ba867e634.pdf
    • https://static.usrfiles.com/ugd/3aee12_483c893cf2f3468d8bd4dd04470f304c.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006be5.bin
239a28bf2bc1eda8fd7b02807fa1238d22dc0715952d2a33a504cf0c674d813f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE5 5176 bytes
font_01_sfnt_off00007d78.bin
c01687c4fdf369d95c7fb7f9ac183abed87a3fc02519ea9237a130e5600f48c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D78 10664 bytes
font_02_sfnt_off0000a237.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA237 16092 bytes
font_03_sfnt_off0000b6ff.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FF 4324 bytes

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