Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70bc125e4342a74…

MALICIOUS

PDF

45.7 KB Created: 2020-08-04 17:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f01e4358e4a85d5509950e86c757459 SHA-1: ece3a6432b390609ddb5182e3c2b650fe2e6a586 SHA-256: b70bc125e4342a740d7220549594b48381dceff6cb80127f8d94c92ee76a5514
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body and embedded links suggest a lure to download a PDF, but the primary link redirects to a known malicious domain. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=estrous+cycle+in+cow+pdf
    • http://files.our-topia.com/uploads/1/3/1/3/131381540/rakixipijorazedi.pdf
    • http://files.grantjacobyanddancers.com/uploads/1/3/0/7/130740112/somepeboba_pexosekazojega_nunilabe.pdf
    • http://vedos.tibbetspta.com/uploads/1/3/0/9/130969332/rewodigagev_pitopetenid_famubepimeno_ridaxilofuzamux.pdf
    • http://files.christbbchurch.org/uploads/1/3/2/6/132696483/9c8391daf661c.pdf
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/ryan_aerator_parts.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20745245188.pdf
    • https://cdn.shopify.com/s/files/1/0430/9696/5269/files/57864875735.pdf
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/reverse_inflation_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6338597663.pdf
    • https://cdn.shopify.com/s/files/1/0440/4209/2694/files/60704974307.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2629/files/67127938766.pdf
    • https://cdn.shopify.com/s/files/1/0434/0069/1868/files/fanupaji.pdf
    • https://cdn.shopify.com/s/files/1/0430/6577/0135/files/essentials_of_sociology_12th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/0718/8898/files/setebivebogona.pdf
    • https://cdn.shopify.com/s/files/1/0429/1143/2857/files/13105952109.pdf
    • https://cdn.shopify.com/s/files/1/0440/1207/7206/files/92856385998.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_off00006865.bin
4b6cb25e814bf69f4974930f4e08ea8101cced870bd9691f7b83f85f4f463464		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6865 4972 bytes
font_01_sfnt_off0000797c.bin
a7320e5f67a6d48a4798b2624f0a38e11246145e420412186a7a1e5e67d46589		 pdf-font-stream PDF embedded font (sfnt) at offset 0x797C 9996 bytes
font_02_sfnt_off00009bb3.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BB3 4324 bytes

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