Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ee576303013573…

MALICIOUS

PDF

42.7 KB Created: 2020-09-01 16:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e08b660aa3c53095ef7e81c83284b6f3 SHA-1: db69094da040666b69d7dec4ad598c9abde611d1 SHA-256: c1ee57630301357341dc9d06ee1793dc0c13ef5693e3253b89d8f3432b88bc45
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. The primary malicious URL, https://ttraff.com/wix?keyword=bar+graph+worksheets+2nd+grade, is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to educational worksheets, likely a lure to encourage clicks on the malicious links. The ML classifier strongly indicates maliciousness.

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=bar+graph+worksheets+2nd+grade
    • https://static.usrfiles.com/ugd/b4f0c6_5d628dbfa35e4928b4baeae06b40c1cd.pdf
    • https://static.usrfiles.com/ugd/b8c837_ea41ad8af7544b85a84fa16b69343393.pdf
    • https://static.usrfiles.com/ugd/07625c_9b4a4c41c85742ae966b775a7b4cc12c.pdf
    • https://static.usrfiles.com/ugd/01bc73_d4a30e3c3da54c7db72ede4d064bdcec.pdf
    • https://static.usrfiles.com/ugd/c6ac46_955de5c4d22e41bbb7da11d11ee3284a.pdf
    • https://static.usrfiles.com/ugd/83b1b3_201edc6f974245b6a4523e484da7d3b6.pdf
    • https://static.usrfiles.com/ugd/b8c837_932a3e4dac5f4f908cf08eeffd8b4eb4.pdf
    • https://static.usrfiles.com/ugd/162fe6_960f25ddc70e4de6b0260fccf3062169.pdf
    • https://static.usrfiles.com/ugd/4dd980_fb8f01f26ef94ca7a08540c2eef64689.pdf
    • https://cdn.shopify.com/s/files/1/0440/4497/6278/files/dutela.pdf
    • https://cdn.shopify.com/s/files/1/0431/5539/0630/files/adalat_bhojpuri_film.pdf
    • https://cdn.shopify.com/s/files/1/0437/8502/7746/files/13539946909.pdf
    • https://cdn.shopify.com/s/files/1/0435/6043/5871/files/smile_quotes_in_english.pdf
    • https://static.usrfiles.com/ugd/e1d12c_fe7a8b86fa7641ae8ae3645305185be0.pdf
    • https://static.usrfiles.com/ugd/a18aa6_2dee9428e82d4988afc101161e92fa72.pdf
    • https://static.usrfiles.com/ugd/ab63e3_cb7d006649fc4740939bfa382fae0103.pdf
    • https://static.usrfiles.com/ugd/455f95_780d52a0e27c4041aba20e50b2cea09d.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_off000068f2.bin
fd84f45085fac639c86b8c1a3324cb4c60c5c35611ec2dce723cf2a91f51b916		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68F2 5528 bytes
font_01_sfnt_off00007bd0.bin
a68790bd8ae3d4e96064d632e4c9f62cfc8cbfa2a09b157fe038260da6f338b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD0 10192 bytes

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