Malicious PDF — malware analysis report

Static analysis result for SHA-256 153e8c546460cbcd…

MALICIOUS

PDF

40.9 KB Created: 2020-08-15 18:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fdb73bc359b306135b2e61084e965ae SHA-1: 016ab61efd482d6d09fc7f74a75a97bedd6c5ba1 SHA-256: 153e8c546460cbcd472802785814204254c8d51cfd754a51fd121b03569a3d58
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to concrete additives and a URL that points to a malicious redirector. The heuristic firings indicate the PDF is designed to link to malicious infrastructure, likely as part of a link farm or phishing campaign.

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/wb?keyword=aditivos%20para%20concreto%20y%20mortero%20pdf
    • http://ninikej.elbeephotography.com/uploads/1/3/1/8/131856333/gifigemomojumub.pdf
    • http://movozu.faithbaptistalturas.org/uploads/1/3/1/3/131380600/xukela.pdf
    • http://zalupumuz.anointedeats.com/uploads/1/3/0/7/130775350/potejumazudoxur.pdf
    • http://wezogugex.blacklines.org/uploads/1/3/0/9/130969352/12f7a4b4c8564c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/6607/8870/files/miwujazo.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/51928639752.pdf
    • https://cdn.shopify.com/s/files/1/0433/8096/5534/files/kafogavawoberuwev.pdf
    • https://cdn.shopify.com/s/files/1/0430/9339/3557/files/agenda_21_onu_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0437/2951/8741/files/91238260339.pdf
    • https://cdn.shopify.com/s/files/1/0427/5005/0460/files/25520792936.pdf
    • https://cdn.shopify.com/s/files/1/0433/5363/7018/files/94240947723.pdf
    • https://cdn.shopify.com/s/files/1/0427/8986/3580/files/noraterel.pdf
    • https://cdn.shopify.com/s/files/1/0429/1756/0473/files/ultimate_capcom_vs_snk.pdf
    • https://cdn.shopify.com/s/files/1/0427/6686/0455/files/wezumukulusaxebuvaje.pdf
    • https://cdn.shopify.com/s/files/1/0433/5114/6650/files/sinudomuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/sidetelox.pdf
    • https://cdn.shopify.com/s/files/1/0431/1462/7234/files/24378838170.pdf
    • https://cdn.shopify.com/s/files/1/0432/5939/6251/files/28472596487.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cb0.bin
0756b02a5879c276d99006cece2c7f05cce8daa9f47aeb551aa580f296e41340		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB0 5420 bytes
font_01_sfnt_off00006f18.bin
b1b8d20a21979c7c5f27d5b6eb85e8826f616824059e2c8fac05807957c03900		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F18 11672 bytes

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