Malicious PDF — malware analysis report

Static analysis result for SHA-256 0871c0a9a8f3b52c…

MALICIOUS

PDF

43.5 KB Created: 2020-08-30 11:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6574b3d74ab7cf5b2417edec1d4492ef SHA-1: d63236a3300e9b69b6ad59a2d4bd75ccd2878344 SHA-256: 0871c0a9a8f3b52c3d348511f19ec9b7a27f6d1a9ed0042167b932d02c4ae5f7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO spamming operation. One prominent link, 'https://ttraff.com/wix?keyword=asus+rt-+acrh13+review', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to disguise its malicious nature. The ML classifier 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.com/wix?keyword=asus+rt-+acrh13+review
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_d2a53d74d6314b2a846eda4372a4e479.pdf
    • https://static.usrfiles.com/ugd/12dc78_2a9ae763b420499aa8262fc8e6199fe5.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b61796fddfc4b8a93a3fb4daf06864d.pdf
    • https://static.usrfiles.com/ugd/a4e402_4bb94e2e008e40caae0d9d7195fdee0d.pdf
    • https://static.usrfiles.com/ugd/ce5d00_b889bcc8d93d48d6a60dded40c6f7c46.pdf
    • https://static.usrfiles.com/ugd/87d215_740cf5bd5f444e2486fdd193daa015f0.pdf
    • https://static.usrfiles.com/ugd/36f25b_78a205e33c95410b843e539db93959dd.pdf
    • https://static.usrfiles.com/ugd/b91566_e9ba2c45ffa64981943b78a259de182e.pdf
    • https://static.usrfiles.com/ugd/824332_793d717021f44155a586df694653dc0b.pdf
    • https://static.usrfiles.com/ugd/b8c837_7d0a4264b1b4400e996c6dcdbdfc7837.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_7550ec9a227b486aa0b891e9a9a1a606.pdf
    • https://static.usrfiles.com/ugd/f65518_d342f7e22be44e178c4ba3c78da26732.pdf
    • https://static.usrfiles.com/ugd/4b68be_f426c0cea2e146c3862ae5770e64f461.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ceea26e3e2048d9b414c072cbb6915b.pdf
    • https://static.usrfiles.com/ugd/b8c837_3628d332627241a2bf1f52c18571251f.pdf
    • https://static.usrfiles.com/ugd/50de67_d7c82c07e69c44b39391019b6fe4fa9c.pdf
    • https://static.usrfiles.com/ugd/b8c837_79d18a12e5bf4706bb62bc5982b6810e.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0accbc53ea149d38056e2367b498ef8.pdf
    • https://static.usrfiles.com/ugd/7baf93_c5fc5b38e2b247b7a8a676e316b59e96.pdf
    • https://static.usrfiles.com/ugd/b8c837_0430c70f4fc94b58b4a252bb469f3863.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ba3.bin
564b49244c6494b0892d9685283a840df7e41c5bacd192cb9ac6304ea76d31cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA3 5244 bytes
font_01_sfnt_off00007d92.bin
c2eff65f9892abdde4ed9a085cb0eb04a70f7fe7b0b70a40942ea540c6d5ee66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D92 10388 bytes

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