Malicious PDF — malware analysis report

Static analysis result for SHA-256 74290e208d3b86f7…

MALICIOUS

PDF

34.1 KB Created: 2020-08-30 17:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39117aafe34720442a677e96992dbaef SHA-1: 4f156712fe8cce1cc1720c06d854bced81fe6a29 SHA-256: 74290e208d3b86f7109f98c8a39830dd7b3d1cba7d2108f0fc050dbc24000c63
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of links to external PDFs, suggesting a link farm or SEO poisoning attempt. The presence of a 'download button' lure further supports a malicious intent to redirect users to potentially harmful content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=sev+proteccion+civil
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4985/1811/files/enlaces_quimicos_unam.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/febipak.pdf
    • https://cdn.shopify.com/s/files/1/0431/5709/4559/files/37900137870.pdf
    • https://cdn.shopify.com/s/files/1/0437/3354/9205/files/introduction_to_automata_theory_languages_and_computation_pearson_education.pdf
    • https://cdn.shopify.com/s/files/1/0436/4225/7561/files/60401108997.pdf
    • https://cdn.shopify.com/s/files/1/0430/8280/9508/files/tavadevojobubo.pdf
    • https://static.usrfiles.com/ugd/b8c837_6266bfeccb6f4ed397cebcdb63f6a4ad.pdf
    • https://static.usrfiles.com/ugd/de65f7_504e455ffed5414f92120a78b04c796a.pdf
    • https://static.usrfiles.com/ugd/d43733_32e0a62f5dae4d21a0e5e7cc4697702f.pdf
    • https://static.usrfiles.com/ugd/b77b08_a4d24d81bc53484db94675ceba1f4bda.pdf
    • https://static.usrfiles.com/ugd/b8c837_7ae49ca277b14659b5e708274f01ce8e.pdf
    • https://cdn.shopify.com/s/files/1/0436/8682/2053/files/55589806409.pdf
    • https://cdn.shopify.com/s/files/1/0433/5622/5694/files/fonavenifom.pdf
    • https://cdn.shopify.com/s/files/1/0430/6822/7737/files/dasuruxilo.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_off000049e2.bin
54d57496e3a1a922cf7a451dbae95e407cf7f5a0299fa0a9084bc9add810d326		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49E2 4700 bytes
font_01_sfnt_off000059f9.bin
91b1105393a98e0897e6b35f4e443c48ef453ce98dacdcccdaad8238602f25f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59F9 9960 bytes

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