Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b4623ef2a50d280…

MALICIOUS

PDF

39.1 KB Created: 2020-08-18 16:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e548f5a96957d4bd2ea23eba8926bda6 SHA-1: 1c85e6a9c16442c00163262d3f51a3c3cc4da380 SHA-256: 2b4623ef2a50d2801dd6efbe1a02cd05a91998bc75b188049ad842dbe009c4db
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL points to 'ttraff.ru', which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains the same URL and a list of other URLs, many hosted on Shopify, likely to appear legitimate. The primary malicious URL is used to redirect the user to potentially harmful content.

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=cortex-+m4+devices+generic+user+guide+pdf
    • http://bisor.worthit.productions/uploads/1/3/0/7/130775443/04cbb68a.pdf
    • https://cdn.shopify.com/s/files/1/0430/4653/5322/files/al_quran_english.pdf
    • https://cdn.shopify.com/s/files/1/0429/6730/2295/files/65128528704.pdf
    • https://cdn.shopify.com/s/files/1/0429/1028/5990/files/cessna_210_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/4052/8792/files/lds_bishops_storehouse_order_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/5679/8615/files/tidofizutudeke.pdf
    • https://cdn.shopify.com/s/files/1/0431/4149/6981/files/vlc_to_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0433/8355/4202/files/98189038668.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9461/files/manualidades_con_reciclado.pdf
    • https://cdn.shopify.com/s/files/1/0439/1682/0648/files/90191575444.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_off00005ab2.bin
66baa43a29a94f4fd984ed9fe564526fac296dcdf3c4bdb624c4353d97cb53c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AB2 5384 bytes
font_01_sfnt_off00006d11.bin
23c6ecb7afb2eb4e30e4e0905a526bac01d47ff4088a85e5b6fb9f33b9e45851		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D11 10192 bytes

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