Malicious PDF — malware analysis report

Static analysis result for SHA-256 915ec202bfad391c…

MALICIOUS

PDF

35.2 KB Created: 2020-09-01 14:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5f5500a9b5ae8bf45a1a83ade9f6778 SHA-1: ce6490d333865bdf25e1b53119f09e6a3579039e SHA-256: 915ec202bfad391ceaf8b420c9013809d8be5296dd2858a6f0ecb0a265696657
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms this, and the ML_NYX_PDF_MALICIOUS flag indicates a high probability of malicious intent. The document body, though heavily obfuscated, contains the malicious URL, suggesting a lure to external content. No scripts were extracted, limiting the analysis of direct execution capabilities.

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/wix?keyword=acute+gi+bleed+guidelines
    • https://cdn.shopify.com/s/files/1/0431/5096/6950/files/alexandre_desplat_new_moon_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0428/5959/3894/files/best_50_free_movie_sites.pdf
    • https://cdn.shopify.com/s/files/1/0432/5300/6494/files/jurofokedolu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8365/3527/files/42375791034.pdf
    • https://cdn.shopify.com/s/files/1/0434/0059/3557/files/68857762406.pdf
    • https://static.usrfiles.com/ugd/b8c837_6a144960a525420684dbeacbb8ec8792.pdf
    • https://static.usrfiles.com/ugd/b8c837_3bb1240c36df4070a09f433bd2f94fb8.pdf
    • https://static.usrfiles.com/ugd/b8c837_874d9c6da6c144c6b21e727e9e793d03.pdf
    • https://static.usrfiles.com/ugd/12745a_48ad04f097274073971b431fc7a6ec14.pdf
    • https://static.usrfiles.com/ugd/10e3af_c5d35461974a496b8ce3bb5e36d1946d.pdf
    • https://static.usrfiles.com/ugd/8127dd_078a7c420fdd428fae1bb1ace2c62eeb.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_off00004cd6.bin
086d24f1c1c2cd77170e4e7332f47d7107947ec4a5f1687d2ac130536b3ec0ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CD6 4932 bytes
font_01_sfnt_off00005db4.bin
ac81e0fc413fdee14a00b6fd6e48e1b637fe30987428ee90241179968a2f8880		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB4 10212 bytes

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