Malicious PDF — malware analysis report

Static analysis result for SHA-256 4848083b9bd12ceb…

MALICIOUS

PDF

43.1 KB Created: 2020-08-24 10:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 99b183444d7012caf37779e2228ffa87 SHA-1: 2ae45b35bc4467d6199cda1f56ddaffd9d518ec9 SHA-256: 4848083b9bd12ceb5614d347193e8ef2f117899ec299752c0f88f80de8746018
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body and metadata suggest it was generated by wkhtmltopdf, and the heuristic firings indicate it's part of a link farm designed to manipulate search results or lead users to malicious sites. The primary malicious URL is https://ttraff.ru/pify?keyword=villagers+pc+game, which is flagged as 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.ru/pify?keyword=villagers+pc+game In PDF document text
    • http://files.alexhancook.com/uploads/1/3/2/6/132680860/vifofati-muxep-sabutuw-digovobud.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/1/0432/1024/4256/files/garnet_hill_extra_long_twin_sheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/9764/9306/files/but_it_is_not_this_day_meme.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7369/0017/files/joxufape.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pufabupenidobuxix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1070/9913/files/python_float_to_string.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9007/4016/files/farmers_almanac_2019_midwest_planting_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2127/9138/files/tepumokesu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5463/6961/files/28874400951.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1740/3559/files/8994432652.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_off00006bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF9 5220 bytes
SHA-256: b6a16be6bfabb1ef1f5a8d0dc8c388032d32d28c56b65f0d134a2451eab0ac90
font_01_sfnt_off00007da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA7 10192 bytes
SHA-256: afb020216eab602b3b55bae93a56170e7d65f4caa95b897cb5deddcb48fba660

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