Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb93e2c71f60aee7…

MALICIOUS

PDF

56.9 KB Created: 2020-08-17 15:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3547fbcec9ec397b2cd8dd35da1a396a SHA-1: 58057402b673a8d07611a7e513714b434fdac3ec SHA-256: fb93e2c71f60aee7b2b867705bceed485d61e339a277102517578356beaa7676
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though partially corrupted, contains a URL that is also present in the heuristics, suggesting a lure to external content. The ML classifier strongly supports the malicious verdict.

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=manualidades+con+material+reciclable+paso+a+paso
    • http://gububob.samuel-evans.co.uk/uploads/1/3/1/6/131606027/sujeluduzetebaw.pdf
    • http://files.youthtechnation.org/uploads/1/3/1/4/131408068/c6b00.pdf
    • http://files.willisband.org/uploads/1/3/1/4/131437655/nuviwu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1143/2857/files/kowinuvudoxune.pdf
    • https://cdn.shopify.com/s/files/1/0434/6766/9654/files/89457714461.pdf
    • https://cdn.shopify.com/s/files/1/0440/1600/9374/files/webadawinipiw.pdf
    • https://cdn.shopify.com/s/files/1/0435/7311/7087/files/wijopazixobujo.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/podemobubozerifusamuta.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78030006053.pdf
    • https://cdn.shopify.com/s/files/1/0432/1142/3902/files/kolulifogejimupebuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4749/files/wopekukeniwupira.pdf
    • https://cdn.shopify.com/s/files/1/0432/4173/4311/files/24523380577.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_off0000a201.bin
f6b9ec41783558fde00a7de48a9a6edbf721e9f340b3cd7964b9df077e2df00a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA201 5364 bytes
font_01_sfnt_off0000b41b.bin
8834aec1f28feac67f25190f0f91d1fe623383c85fa4feed398c2958a2d73746		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB41B 10204 bytes

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