Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7f2afdb74de590…

MALICIOUS

PDF

142.4 KB Created: 2020-09-02 08:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 76a0aa20df6f6c90ea134015cd617324 SHA-1: 3be329f57c1bb05b007d4ca18b60d68ad34193d6 SHA-256: 7c7f2afdb74de5902ad01f909fdc179e04b091058b7ddcdc9250c9cf6c236635
154 Risk Score

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 0.9999

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.me/wix?keyword=pascal%2527+s+triangle+binomial+expansion+worksheet In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/0d2908_d09aae4e08474df8aa01f6f219e4bb15.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c7ef1a_464cefc6da28470b94d865d104c4f6d8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/43d598_c7bbbb6488c14f7a883b14478e934a9c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b13fd1_c6dea599353643ac8a5b78312f140453.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/65477972927.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/6461/9171/files/cards_against_humanity_examples.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/9886/0707/files/rirukuxokafesaxaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6338/6016/files/14253896954.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2154/8194/files/97952093050.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0740/9308/files/79256218971.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1510/2876/files/bully_apk_mod_1._0._0._18.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/1677/6862/files/sobatidukaxugoremine.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9481/9484/files/asako_i_ii_sub_indo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/7131/3822/files/blackberry_passport_android_port.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xazijejizamoketabuguta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9352/2587/files/78895482640.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_off0001e6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6CF 5748 bytes
SHA-256: 038e19f7b4962cdf5d3f19b5bcb5e05bd6c06fb1dd8c5595933db72f039fc26b
font_01_sfnt_off0001fa52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA52 14860 bytes
SHA-256: 0465d955aca3d71b3cc5a9f4444e3cab1d469a35b4aa4bc362aba0246b12f768

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