Malicious PDF — malware analysis report

Static analysis result for SHA-256 e472028b76422f6d…

MALICIOUS

PDF

44.7 KB Created: 2020-08-10 11:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca8383112dd7fdef5ba53de54acad3b2 SHA-1: b9aed49710e294f9bb3a9e013e85ab1bfb31564d SHA-256: e472028b76422f6d8a860aabe83bb28f257d0cf7de32ea7b5325deb24b0eb1ed
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious due to a high number of embedded links pointing to redirector infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The PDF_SEO_LINK_FARM heuristic further indicates a mass of external PDF links, suggesting an attempt to distribute malicious content or phish users. The ML_NYX_PDF_MALICIOUS model also strongly supports the malicious classification. The primary IOC is the redirector URL, which likely serves as the initial point of compromise.

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=swot+analysis+apple+pdf
    • http://files.rmccartney.com/uploads/1/3/0/7/130775387/7861130.pdf
    • http://files.reliefandreconciliation.org/uploads/1/3/1/6/131606901/pedufojujakez_gonadida.pdf
    • http://files.theoliveshopestore.com/uploads/1/3/2/6/132680827/fogimefaw-janasimota-vurepaxovi-nelolufig.pdf
    • http://rakab.byblosdevelopers.com/uploads/1/3/1/6/131607163/7432439.pdf
    • http://files.blaketweld.com/uploads/1/3/1/4/131438071/dokirogujuvu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2060/files/wazaforelexe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45292738862.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xokuwunojuvilil.pdf
    • https://cdn.shopify.com/s/files/1/0432/1627/3563/files/tarujov.pdf
    • https://cdn.shopify.com/s/files/1/0432/4599/4146/files/standard_deviation_in_python.pdf
    • https://cdn.shopify.com/s/files/1/0439/3756/2779/files/trigonometry_10th_edition_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/4864653665.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0309/files/nidedaxojuviziferegixukod.pdf
    • https://cdn.shopify.com/s/files/1/0430/7379/8306/files/11219125703.pdf
    • https://cdn.shopify.com/s/files/1/0439/5037/5070/files/2291258360.pdf
    • https://cdn.shopify.com/s/files/1/0435/8383/2227/files/sqrt_x_x.pdf
    • https://cdn.shopify.com/s/files/1/0431/9612/1248/files/17863390675.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_off000071a0.bin
a68377cac784e8b45fb306d01e6e422c9936a7b5de54285f57f85286fe7ab31d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71A0 5236 bytes
font_01_sfnt_off000083a4.bin
172a8f08e14e276b9761a7a7fb759070db807bea19c541d582cfd8869275e504		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83A4 10092 bytes

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