Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b7a2cd149007362…

MALICIOUS

PDF

42.5 KB Created: 2020-08-28 10:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9e94d24fdc33641bcf47cecdbcb90a0 SHA-1: c7b4c5cb48be8049e997b3e603d0e102166a8f75 SHA-256: 1b7a2cd1490073624e578b7cd8e717055d8bb4ff2533e19316bf40fcb02fc00b
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one pointing to a known malicious redirector (ttraff.com). The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, many hosted on Shopify, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring users through a seemingly innocuous document to click on malicious links.

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.com/pify?keyword=propiedades+de+los+hidrocarburos+ali
    • http://susiroge.industrialcommercialdomestic.com/uploads/1/3/1/6/131637881/ec702f890c30879.pdf
    • https://cdn.shopify.com/s/files/1/0435/5257/1555/files/dictionary_definition_worksheet_ks2.pdf
    • https://cdn.shopify.com/s/files/1/0441/2728/9496/files/98203438887.pdf
    • https://cdn.shopify.com/s/files/1/0432/7099/6128/files/prostitutas_de_Indianpolis.pdf
    • https://cdn.shopify.com/s/files/1/0433/9741/5077/files/favek.pdf
    • https://cdn.shopify.com/s/files/1/0433/0287/9387/files/firizoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/5768/4375/files/regag.pdf
    • https://cdn.shopify.com/s/files/1/0435/4883/6004/files/gosajatoledokudolaleja.pdf
    • https://cdn.shopify.com/s/files/1/0433/4485/5194/files/naruto_shippuden_struggle_ninja_mugen_apk.pdf
    • https://cdn.shopify.com/s/files/1/0433/9302/4151/files/building_operation_and_maintenance_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/1682/2679/files/aprender_ingles_avanzado.pdf
    • https://cdn.shopify.com/s/files/1/0435/1547/8176/files/22519851858.pdf
    • https://cdn.shopify.com/s/files/1/0433/8457/0019/files/vabuwoxisevirarabudir.pdf
    • https://cdn.shopify.com/s/files/1/0435/7583/6840/files/dokisivujikajo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058eb.bin
123372cd72620fa0294ffe26ea851d640e4dd9136922912c64c82a80b2b1d515		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58EB 5000 bytes
font_01_sfnt_off000069dd.bin
90f71b7f387a42019e7031cb846d4c16fdf6c491ee625a9d6d904fc404c07ad8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69DD 10936 bytes
font_02_sfnt_off00008d5b.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D5B 4324 bytes

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