Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b7bfdd1bf51056…

MALICIOUS

PDF

44.3 KB Created: 2020-08-30 21:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1605976944cc0f598647379e195ad74d SHA-1: 5f3f87b3c34afa820611efddbbea7e338f33e076 SHA-256: 88b7bfdd1bf51056747d187bd98d418b5d72f1c7e6ef71276b828f6f4c5612c2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/wix?keyword=weighted+average+excel+download'. This URL is presented within the document body, disguised as a weighted average Excel download, indicating a phishing or social engineering lure. The PDF also hosts a large number of external links, many pointing to Shopify domains, suggesting a link farm used for SEO poisoning or distributing malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/wix?keyword=weighted+average+excel+download
    • https://cdn.shopify.com/s/files/1/0433/1444/6489/files/noxotorokokutokujoliser.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/12518711507.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58933331969.pdf
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/5319160048.pdf
    • https://cdn.shopify.com/s/files/1/0464/7855/7352/files/spatial_sound_card_free.pdf
    • https://cdn.shopify.com/s/files/1/0459/9942/3647/files/allanson_street_school_uniform.pdf
    • https://cdn.shopify.com/s/files/1/0462/6943/1959/files/banidufikisazasa.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1810/files/lebotoreruwururuvu.pdf
    • https://static.usrfiles.com/ugd/a4d998_0e16434cb1444561b784e6f938b02281.pdf
    • https://static.usrfiles.com/ugd/b8c837_95a10b81cf5340b9a07e7fe26bdcb1bd.pdf
    • https://static.usrfiles.com/ugd/b9801a_98495067c7074aee8acbe570805a3a2f.pdf
    • https://cdn.shopify.com/s/files/1/0428/9868/6111/files/93811854472.pdf
    • https://cdn.shopify.com/s/files/1/0428/6568/8743/files/segeb.pdf
    • https://cdn.shopify.com/s/files/1/0428/3321/5654/files/13867087139.pdf
    • https://cdn.shopify.com/s/files/1/0436/5769/1289/files/anaphylactic_shock_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0431/6410/6908/files/45619935162.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_off00006ea2.bin
747e746d290de038dae96a6e534dceb4ed203505ca66cdedd3feff6c5d149f89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA2 5256 bytes
font_01_sfnt_off0000809c.bin
b1ab979504ccca9ca3673d67099db4e75149f630a2548d2f591879be4d557d19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x809C 10448 bytes

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