Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf22c3aed622da67…

MALICIOUS

PDF

44.1 KB Created: 2020-08-12 10:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 195b0f8798395acb89b9a88cfbf6dc82 SHA-1: cafce7ced2b6ebac72d4ecaacac4631cafc27e94 SHA-256: bf22c3aed622da6791fa864c3a7b89596b1c3204b43486e821f032423bd742d9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links, https://ttraff.com/pify?keyword=bioinstrumentation+jg+webster+pdf, is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. The document body contains garbled text but also includes the malicious redirector URL and several other PDF links, suggesting a lure to external malicious content.

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/pify?keyword=bioinstrumentation+jg+webster+pdf
    • http://files.thesenseofplace.com/uploads/1/3/1/0/131071145/tesotitikas.pdf
    • http://varuwomej.tradingtreasurescrystals.com.au/uploads/1/3/0/8/130814011/wewexofinasigewul.pdf
    • http://files.stephaniebuckle.com/uploads/1/3/0/8/130814258/vigapatexe_newukatotaveti_gereposot.pdf
    • http://files.wscottwintrup.net/uploads/1/3/2/7/132712306/pudikik_xotimoxisa.pdf
    • https://cdn.shopify.com/s/files/1/0435/3346/7807/files/tekobupasasotupenomesa.pdf
    • https://cdn.shopify.com/s/files/1/0435/7026/6273/files/dupinomafidamev.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/47586866876.pdf
    • https://cdn.shopify.com/s/files/1/0449/0860/9703/files/nogexor.pdf
    • https://cdn.shopify.com/s/files/1/0429/5966/7363/files/sales_qualification_process.pdf
    • https://cdn.shopify.com/s/files/1/0432/5621/7750/files/zuzokezebebasifan.pdf
    • https://cdn.shopify.com/s/files/1/0429/7955/7539/files/28607256806.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sivezijikok.pdf
    • https://cdn.shopify.com/s/files/1/0438/4132/3170/files/jimupobumumedofalu.pdf
    • https://cdn.shopify.com/s/files/1/0436/5592/1817/files/wozewaxorotozo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/38849579267.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5347/files/search_engine_marketing_guide.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_off00006e2a.bin
b22b1ddd922e7e74c0b5957205772a25456e6b09ac2c5abbd093f99aaa5ab75f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E2A 5684 bytes
font_01_sfnt_off00008175.bin
02e1e1e4b51bee7602c448e8a508cb17915a1d5f5f146577e38d164c75afe924		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8175 9984 bytes

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