Malicious PDF — malware analysis report

Static analysis result for SHA-256 65df418843d7efb8…

MALICIOUS

PDF

53.0 KB Created: 2020-11-09 17:14:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: acafcbe1641e1b1829f87d1b93966ce0 SHA-1: d092c321d1169f447ca6048343cd34467b5bcf9e SHA-256: 65df418843d7efb85d70445e453a121f0bd1950e207f9f4e1764f6b20fa31998
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffmen.ru/123?keyword=circulation+diagram+architecture In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383321/normal_5f8baf1982c72.pdfIn PDF document text
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/sevubinizibalux_bidon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366628/normal_5f871f71f2162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371788/normal_5fa30362158a6.pdfIn PDF document text
    • https://gugewixurot.weebly.com/uploads/1/3/4/3/134393699/300bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371003/normal_5f8eb0712f241.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f98df95d8382.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368970/normal_5f9519b0e1df8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475379/normal_5fa64a572fb49.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tetazino/22028738540.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/42619622672.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/sunurujijupumavedisakubi.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/bamorojofolib.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A17 5080 bytes
SHA-256: 196d7504773480c7edf1cb4ebf5e9118adcfa7beeceb90835803216f89dee3c1
font_01_sfnt_off00008b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B2B 11244 bytes
SHA-256: 01d28589d93e73aaf2cbe6c805fce5a88f1224ab83078e1adc0cfc2d9de1680c
font_02_sfnt_off0000b208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB208 16144 bytes
SHA-256: 18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b

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