Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a05ee43ab9d5f4…

MALICIOUS

PDF

40.7 KB Created: 2020-09-20 05:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1a9cb532014f9fb5b0cc95656ce71c9 SHA-1: 404c55709f52811bdb4aa373fc080adf8ff3b5c7 SHA-256: 76a05ee43ab9d5f4189843de7512ef895e278ac724cd8a364cb87f4d29ae6f1a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded links, many of which point to Shopify domains, but one critical link redirects to a known malicious domain. The document body is heavily obfuscated but contains a reference to '300mb dual audio movies free download for pc', suggesting a lure for pirated content. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a malicious redirector.

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.club/wix?keyword=300mb+dual+audio+movies+free+download+for+pc
    • http://files.battambangparish.org/uploads/1/3/2/6/132681002/d767baf407e6.pdf
    • http://files.nphsjrwolfpack.com/uploads/1/3/1/4/131408139/ninabopot.pdf
    • https://cdn.shopify.com/s/files/1/0431/2976/6039/files/53415525399.pdf
    • https://cdn.shopify.com/s/files/1/0435/8340/6239/files/76460650358.pdf
    • https://cdn.shopify.com/s/files/1/0440/7522/1157/files/bodafarakel.pdf
    • https://cdn.shopify.com/s/files/1/0431/3258/4098/files/motorcycle_key_tags_canada.pdf
    • https://cdn.shopify.com/s/files/1/0434/1540/4702/files/definition_of_economics_by_different_economists.pdf
    • https://cdn.shopify.com/s/files/1/0437/1621/4939/files/carrier_warranty_transfer_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/4138/9720/files/ragidavaxarubokedeletipoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/5366/2887/files/ok_magazine_cover_template.pdf
    • https://cdn.shopify.com/s/files/1/0438/7074/8827/files/ac_dc_greatest_hits_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3031/files/rutumomatasevibigenab.pdf
    • https://cdn.shopify.com/s/files/1/0427/4490/5884/files/mikevulurofexozux.pdf
    • https://cdn.shopify.com/s/files/1/0434/9935/6324/files/72052989742.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006012.bin
83c11e11125e962e277e1258ae0b213628d3638901d48ba0b9d6067e52289c52
pdf-font-stream PDF embedded font (sfnt) at offset 0x6012 5804 bytes
font_01_sfnt_off000073cc.bin
02dc2b6a53b06279b2bec0bff59783a40af3d92eefc3559f8df78819bd4870bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x73CC 9852 bytes