Malicious PDF — malware analysis report

Static analysis result for SHA-256 175cb7b15a688cca…

MALICIOUS

PDF

48.5 KB Created: 2020-09-08 05:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62b0c6859d4d1ed11e407a003d3c2cbe SHA-1: 49b6e3e25c326da5c0da249c39ac34f3e10ca210 SHA-256: 175cb7b15a688ccaef8d3e7eb190ce65f2491269cbcbbdebbb5880d070766512
154 Risk Score

Malware Insights

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

The PDF contains a link farm with a high number of external links, including a redirector to a malicious URL. The document body text, though heavily obfuscated, contains the URL "https://ttraff.link/wix?keyword=android+auto+head+unit+xda", suggesting a lure to a malicious site. The ML classifier strongly indicated maliciousness, and the presence of numerous links points to a link farm or SEO abuse tactic.

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.link/wix?keyword=android+auto+head+unit+xda
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/ccf397_5a43831876644d13bf6e10fbe5b78536.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9cb98e7aaa244ebb303e8d3e69481bb.pdf
    • https://static.usrfiles.com/ugd/45fd81_5c332d380eb4413882b35c6124900550.pdf
    • https://cdn.shopify.com/s/files/1/0432/9717/7768/files/1426421723.pdf
    • https://cdn.shopify.com/s/files/1/0432/4861/5579/files/gurifokepaninojine.pdf
    • https://cdn.shopify.com/s/files/1/0434/0980/1365/files/81448508219.pdf
    • https://cdn.shopify.com/s/files/1/0429/3676/2527/files/banner_ad_design_templates_free.pdf
    • https://cdn.shopify.com/s/files/1/0440/0830/8886/files/empaques_y_envases_especializados.pdf
    • https://static.usrfiles.com/ugd/77941b_5eed1bf3edc3440c82f8abb7aa98f27a.pdf
    • https://static.usrfiles.com/ugd/60e703_4ab974504ea94a5ba62d862f59fa0d2f.pdf
    • https://static.usrfiles.com/ugd/e4a001_b9017524d839416f91f7c190edc90913.pdf
    • https://static.usrfiles.com/ugd/18ee90_7b9a8cf98b8b461fb8dff55ab893fa7d.pdf
    • https://static.usrfiles.com/ugd/d43733_480beb617d664c94bb547dfcd1f545a3.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_e10da5b1377e42fda0822ccfa5434c60.pdf
    • https://static.usrfiles.com/ugd/cf79db_102a1a072ad54fc4af98cddca235f455.pdf
    • https://static.usrfiles.com/ugd/33ab24_8b7409d395b040f2806bc9f0b328b922.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_off00008297.bin
3da21d6ae97f7ae989398daa44dff3ba74672fccd05dee6eec9614f89193ad17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8297 4760 bytes
font_01_sfnt_off000092be.bin
0d4be9170c79bb9fa7e16cb92914b7a3144c6403a7baf020197a3ba0c888a7c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92BE 10052 bytes

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