Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d6d493c013adcfb…

MALICIOUS

PDF

37.9 KB Created: 2020-08-06 00:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8bd56e109b3d09cf9a2fb859e7187d3a SHA-1: d9cea80b1e42acb9155ff8ffd31df44701da9f6a SHA-256: 5d6d493c013adcfb5a3019ab056585d1f3248d950df73f30d51ff43a0e685900
154 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a redirector service, which is a common tactic for distributing malware or phishing pages. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to appear as a search result for a specific document, likely to trick users into clicking the malicious link. No scripts were extracted, but the presence of a malicious redirector URL is a high-confidence indicator of malicious intent.

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=aula+internacional+1+nueva+edicion+solucionario+pdf
    • http://files.neuroimmunekids.org/uploads/1/3/1/0/131069934/3926061.pdf
    • http://files.aprilfordart.com/uploads/1/3/1/0/131070374/69244d.pdf
    • http://files.athenskidsmart.com/uploads/1/3/0/9/130969751/5336a6e6f9ad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/3170/7294/files/bernard_lewis_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/2558/7609/files/97960558471.pdf
    • https://cdn.shopify.com/s/files/1/0433/8358/6977/files/common_stocks_and_uncommon_profits_full.pdf
    • https://cdn.shopify.com/s/files/1/0432/5618/4992/files/kiludosofuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/1344/7584/files/82360960345.pdf
    • https://cdn.shopify.com/s/files/1/0436/9973/2635/files/56098168690.pdf
    • https://cdn.shopify.com/s/files/1/0428/7512/5919/files/john_deere_870_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/5394/8836/files/xapesopafefebugid.pdf
    • https://cdn.shopify.com/s/files/1/0430/5554/6517/files/42634572311.pdf
    • https://cdn.shopify.com/s/files/1/0431/4015/3505/files/voligaviveg.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/93783711391.pdf
    • https://cdn.shopify.com/s/files/1/0432/3698/2944/files/20908823581.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/jexojekefosukevuru.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/pobiwineken.pdf
    • https://cdn.shopify.com/s/files/1/0431/6325/4944/files/83490694992.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_off00004926.bin
75a7ce0e73327971cdfe4541703ee9ca899e53ab5a33860b648c1924b0af182b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4926 5132 bytes
font_01_sfnt_off00005aac.bin
1075ab4bbe4a7df402e4712c35945d18d27666a55cc8c91ed33d3b29d3fbd8e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AAC 10208 bytes
font_02_sfnt_off00007c46.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C46 4324 bytes

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