Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd522dc5e8e3754…

MALICIOUS

PDF

40.2 KB Created: 2020-08-30 01:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fbf2fee04d9f7268646a3d5df0f8b9b SHA-1: 2d011f56646c4609f620d8b0f46629d81b021cd7 SHA-256: 5bd522dc5e8e375416d7fa834c3efaba9702091d2856af01bfebd9975684de8b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to a redirector service. The primary heuristic indicates that the PDF links to known malicious redirector infrastructure, suggesting an attempt to direct users to harmful content. The document body itself contains the malicious URL and numerous other PDF links, reinforcing the link farm attack pattern.

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/wix?keyword=dj+hans+bhangra+mashup
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/2b3f46_e84d20a3438a4502882a9e7468ea4ae2.pdf
    • https://static.usrfiles.com/ugd/b58d21_1ea7627f7f0a4d57a623ea4f107b4a3f.pdf
    • https://static.usrfiles.com/ugd/93971e_3d1b5c4a33df467bbdd549f5666ee14a.pdf
    • https://static.usrfiles.com/ugd/8cbfce_6c112e3beb9a41ce8e4a1df4b63356a4.pdf
    • https://static.usrfiles.com/ugd/69695d_ef1d35a6a8b94f339b35ea0d584a8f6c.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e26aba2fe3248e48108a57d43fa3a8c.pdf
    • https://static.usrfiles.com/ugd/b8c837_d008720e64f5469e906359ab5684feeb.pdf
    • https://cdn.shopify.com/s/files/1/0459/6875/2807/files/miwumovojopebujofezinalim.pdf
    • https://cdn.shopify.com/s/files/1/0434/5734/7749/files/tumblr_ios_7.pdf
    • https://cdn.shopify.com/s/files/1/0436/3812/8793/files/kogivi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0408/4899/files/caroline_chisholm_catholic_college_uniform.pdf
    • https://static.usrfiles.com/ugd/93c935_8f8b35f369174397b4276ce94db49de2.pdf
    • https://static.usrfiles.com/ugd/49be48_6c602f4418fb4b72a8b221802b0dde5c.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce05cf86db0144eb851017ae7d83654a.pdf
    • https://static.usrfiles.com/ugd/b8c837_2dc9ff70fd914d5fa4a2ff22bcb19ab2.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000449f.bin
89404303b61ab66b84ac6d703ac111a9dec2b5a7723097c9d8cc45f2e5dbb902		 pdf-font-stream PDF embedded font (sfnt) at offset 0x449F 5416 bytes
font_01_sfnt_off000056db.bin
3a91dab0430f10a8085c867136d39e07b5d74bc0754d2710a47c7589dcb3de5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56DB 1592 bytes
font_02_sfnt_off00005ef8.bin
95a8e5fcf3212b961e189665ba111b4bc1f1b3499617480d131acf03290a11d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF8 9220 bytes
font_03_sfnt_off00007eb4.bin
d8a1a34de14a7b8fce5e51635835121d353d188f9ac9ce1e11538509fd4c5cdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB4 16060 bytes

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