Malicious PDF — malware analysis report

Static analysis result for SHA-256 7052da3772e27337…

MALICIOUS

PDF

51.8 KB Created: 2020-08-21 21:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ec8231f9d7d0d3c20a25908d5de14d2 SHA-1: 5fec9bb0a41ec5047ebbc1baa0d1ec40d2aabad5 SHA-256: 7052da3772e2733743a74029f26bbcff2046cbf3a70bffa7b8a594b516ce0d6b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to external PDFs, which is indicative of a link farm. One of the primary links directs to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and embedded links suggest a malicious intent to redirect users to harmful 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=houdong+guided+missile+boat
    • http://mipudel.cogsuite.net/uploads/1/3/0/7/130739275/1286e9.pdf
    • http://kowal.wjeclatinresources.com/uploads/1/3/0/8/130813395/a1dc0594df991.pdf
    • http://files.phirediamond.com/uploads/1/3/0/7/130738712/suvetegudukoja.pdf
    • http://files.metalempireproductions.com/uploads/1/3/1/6/131606688/485f30f.pdf
    • http://kolelusuj.sigmachapter.org/uploads/1/3/1/4/131453540/jonojod-givufuxetamo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4498/7292/files/integral_calculus_for_gate.pdf
    • https://cdn.shopify.com/s/files/1/0436/9815/9769/files/1359074478.pdf
    • https://cdn.shopify.com/s/files/1/0450/2824/5654/files/uniformly_continuous_function_is_bounded.pdf
    • https://cdn.shopify.com/s/files/1/0431/3579/5354/files/40348087498.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/blank_calendar_template_september_2018.pdf
    • https://cdn.shopify.com/s/files/1/0433/6451/6005/files/business_analysis_reporting_tools.pdf
    • https://cdn.shopify.com/s/files/1/0433/7342/8888/files/gl_to_sd_card.pdf
    • https://cdn.shopify.com/s/files/1/0450/7097/5128/files/xubatebilimizekexixiguzit.pdf
    • https://cdn.shopify.com/s/files/1/0429/1428/3686/files/riesgo_financiero_libro.pdf
    • https://cdn.shopify.com/s/files/1/0434/5420/2018/files/wurazivofikezolukux.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/cations_and_anions_test.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006437.bin
edb31f4fb241825d6a09873797b26e0ea48825c449a2c64762e76c81312f7909		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6437 11908 bytes
font_01_sfnt_off00008af1.bin
b2b874604eab35c250fdfc1154fe872357d6e1c7a37abda1c14110fc9d03a6db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF1 5148 bytes
font_02_sfnt_off00009c5d.bin
e8280c9d8e8ad4755b10351f05c13075eaa5d346ca3322fbfcb04f434e2b6b58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C5D 11104 bytes

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