Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8ac92c6811c8c8…

MALICIOUS

PDF

38.2 KB Created: 2020-08-30 12:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e27d49bc7fb9984fdbcf98199e31644b SHA-1: d4a842a337610636278eda27aa7ed59cd3a0ac70 SHA-256: 7e8ac92c6811c8c87daf4052d96397fd41eee4b661c820a929f4a863a8416c3f
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.cc, disguised as a search result for 'manual ford fiesta 2005 pdf'. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on cdn.shopify.com and static.usrfiles.com, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly indicated 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.cc/wix?keyword=manual+ford+fiesta+2005+pdf
    • https://static.usrfiles.com/ugd/b5aed9_34f4d1d4c1034d33aad8da6059568ba2.pdf
    • https://static.usrfiles.com/ugd/ba3095_2031620e1f7a430f82041d3c7c8238c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_490aa790dd5a4d7a8d9506a8d4864a6d.pdf
    • https://cdn.shopify.com/s/files/1/0430/2897/1681/files/8002836056.pdf
    • https://cdn.shopify.com/s/files/1/0432/6581/8782/files/75588872130.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8360/files/molecular_diagnosis_of_breast_cancer.pdf
    • https://cdn.shopify.com/s/files/1/0440/1886/0190/files/2446322571.pdf
    • https://cdn.shopify.com/s/files/1/0428/9429/5203/files/44835040229.pdf
    • https://cdn.shopify.com/s/files/1/0430/4230/8250/files/yaar_beli_movie_filmywap.pdf
    • https://cdn.shopify.com/s/files/1/0432/2616/9503/files/d_d_3._5_books_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/2188/3816/files/dcfs_mandated_reporter_manual_illinois.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_off00004aba.bin
ab1974489a7c9cd0569a96fd3f664bc9924cdf318637a0ca5d676e12b4917690
pdf-font-stream PDF embedded font (sfnt) at offset 0x4ABA 5320 bytes
font_01_sfnt_off00005cdd.bin
1e383340a7a9eb8a11b300355d4b90bde3b0d37de3e0f3c7368f28316dd8b6b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CDD 9748 bytes
font_02_sfnt_off00007e35.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E35 4324 bytes