Malicious PDF — malware analysis report

Static analysis result for SHA-256 07885d756108cf98…

MALICIOUS

PDF

47.0 KB Created: 2020-09-30 12:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6f94088c4d31f1bc41d95f23462d910e SHA-1: 41585be6624e4f77b6ae52e3d8f042f530bf8d1a SHA-256: 07885d756108cf984b4b576adb6b03af9e631f2b0e285e79920846084660d847
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 several pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are also present in the list of embedded links. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to manipulate search engine results or direct users to malicious sites.

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://cctraff.ru/strik?keyword=hiv+aids+pdf+in+marathi In PDF document text
    • http://files.cattailsfinegifts.com/uploads/1/3/0/8/130814868/giduraxunuwefig.pdfIn PDF document text
    • http://files.qksnd.com/uploads/1/3/1/3/131398194/7325071.pdfIn PDF document text
    • http://files.faithtabernaclefellowship.org/uploads/1/3/1/4/131437987/4707623.pdfIn PDF document text
    • http://zuwak.lchayimofgalt.net/uploads/1/3/1/4/131437849/golilirekakaxazitofa.pdfIn PDF document text
    • https://site-1038975.mozfiles.com/files/1038975/zekateje.pdfIn PDF document text
    • https://site-1037111.mozfiles.com/files/1037111/97048854811.pdfIn PDF document text
    • https://site-1037205.mozfiles.com/files/1037205/30108435154.pdfIn PDF document text
    • https://site-1037142.mozfiles.com/files/1037142/37397221694.pdfIn PDF document text
    • https://site-1037077.mozfiles.com/files/1037077/tuxiroxesovaxowun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/2715/8424/files/19769839828.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5240/7704/files/klasifikasi_bakteri_coliform.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8814/0696/files/xpath_contains_text.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93236297381.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79E9 5268 bytes
SHA-256: c58ea5ae304d03ed14d1157981017a42f642121c81b61bf7542714b05332206f
font_01_sfnt_off00008bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB0 10576 bytes
SHA-256: 272cb0ea65060bd1568afdb3ce586acc48891a9684df3bc803c36dc38586f174

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