Malicious PDF — malware analysis report

Static analysis result for SHA-256 7487a51e141445f2…

MALICIOUS

PDF

33.1 KB Created: 2020-08-30 19:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9b4d2b16b80bff843cf97a0f0350d1c SHA-1: 728343dd363098b3cfb92d740b033d9e0cb60667 SHA-256: 7487a51e141445f282b258d78ce2b2ed23b6e085c19ad8f5b64df2c14a8e092d
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as an instruction manual for a Buzz Lightyear toy. The ML classifier strongly indicated maliciousness, and the PDF was found to contain a link farm pointing to external PDFs, with one URL identified as a known malicious redirector. The document body and embedded links suggest a social engineering lure to drive traffic to malicious infrastructure.

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.ru/wix?keyword=buzz+lightyear+toy+instruction+manua
    • https://static.usrfiles.com/ugd/576447_8bf3e07cb1d143b18df08c4378919c41.pdf
    • https://static.usrfiles.com/ugd/b8c837_a11de11dcac94997b71c16250d4e173c.pdf
    • https://static.usrfiles.com/ugd/b8c837_782af9f86f0f42eb96f5965a607cb2f8.pdf
    • https://cdn.shopify.com/s/files/1/0433/3849/8206/files/27512183304.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tipibag.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0687/files/wakitikasevonotubile.pdf
    • https://cdn.shopify.com/s/files/1/0430/1373/4563/files/pasar_cade_simu_a.pdf
    • https://cdn.shopify.com/s/files/1/0435/5771/6119/files/worifokimofejobu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7289/6672/files/71315926216.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7222/files/puxilomobupuruzutekel.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_off000043b5.bin
41f788ca67245a796dfd09abc7e34128eb202aef565d1af1f2af61670789bce6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43B5 5416 bytes
font_01_sfnt_off00005602.bin
b33761ecb2572ce7c1e00f61e4e7a71feecb55c0981181248c07005c3b672618		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5602 10040 bytes

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