Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3c97ee156b1234…

MALICIOUS

PDF

33.2 KB Created: 2020-08-15 06:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4f2febd2053013f6e48eb14c9136c48 SHA-1: 9ada57bd681634bb00094414d469d9520c3bacc3 SHA-256: 8f3c97ee156b1234561106fa252cfea4be0cdf9e9242fbda688d57184354cfac
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL and a book title, suggesting a lure. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample.

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.ru/pify?keyword=alucinaciones+y+delirios+carmen+valiente+pdf
    • http://netejerax.calvarychapeljonesboro.org/uploads/1/3/1/6/131606419/2439655.pdf
    • http://moseg.carolheilman.com/uploads/1/3/1/3/131380600/wisofo.pdf
    • https://cdn.shopify.com/s/files/1/0444/7505/6295/files/wevelinuzupinoruduke.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/56193387449.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/491449634.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5702/files/35934516637.pdf
    • https://cdn.shopify.com/s/files/1/0432/5664/3739/files/zapizorijeval.pdf
    • https://cdn.shopify.com/s/files/1/0435/0276/4184/files/wefamuwaxowedumowozumigad.pdf
    • https://cdn.shopify.com/s/files/1/0432/2423/6199/files/attributeerror_lower_not_found.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/matam.pdf
    • https://cdn.shopify.com/s/files/1/0433/1179/2286/files/xajexiwebugusimumizegotix.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_off0000429a.bin
8bf64d29342e83593411f057357b540cbdb8843b9d7835ff370a8837e5490aa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x429A 5452 bytes
font_01_sfnt_off00005513.bin
ea12dacbd76273b45bb516442e2b791bf8c15298227bebf4294f670e72b72937		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5513 10240 bytes

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