Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39cc45760a4b303…

MALICIOUS

PDF

42.1 KB Created: 2020-08-18 19:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 051a8bd2d70cff650c466be1b450d05c SHA-1: 75316e99e49766286fb99b3af582bc09d01a3091 SHA-256: f39cc45760a4b30331c045ca3ac320c48e182bf749fd94f6bad6df430e7a58ae
150 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a large number of external links, a common tactic for SEO poisoning or distributing malicious content. One of the embedded URLs, 'https://ttraff.cc/pify?keyword=notes+function+notation+answers', is identified as a known malicious redirector. The document body, though heavily obfuscated, contains references to the redirector URL, suggesting it is the primary malicious component.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=notes+function+notation+answers
    • http://xurobe.leapaheadcenter.com/uploads/1/3/0/7/130775606/nukiriwili.pdf
    • http://nunovijat.gaetaboys.com/uploads/1/3/1/4/131454165/tibifogenigulor.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9786/files/xidikokunukimokes.pdf
    • https://cdn.shopify.com/s/files/1/0436/3796/4960/files/86000712942.pdf
    • https://cdn.shopify.com/s/files/1/0429/7952/4759/files/ruluvebodixunuso.pdf
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/40752546921.pdf
    • https://cdn.shopify.com/s/files/1/0438/2585/6672/files/lufavobuvega.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/south_africa_political_map.pdf
    • https://cdn.shopify.com/s/files/1/0432/8351/3494/files/68756152358.pdf
    • https://cdn.shopify.com/s/files/1/0435/3903/8360/files/42809190915.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9284441163.pdf?v=1594212706
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/mulafo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3741/6869/files/39403100678.pdf
    • https://cdn.shopify.com/s/files/1/0438/8444/5864/files/43905201106.pdf
    • https://cdn.shopify.com/s/files/1/0435/8999/2605/files/17493137263.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/
    • https://cdn.shopify.com/s/files/1/0438/2585/6672/fi

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067e6.bin
28e222e8a9ad1dc3418d0651bf5241575dafcecd02b065964ce8760993676346		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67E6 4904 bytes
font_01_sfnt_off000078bf.bin
b1d1d8fb95355517d0105a6f0c04eb47925bcb789bd98fff50316c24bcd7fa52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78BF 10100 bytes

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