Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d572a48c67c385f…

MALICIOUS

PDF

35.6 KB Created: 2020-09-17 13:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af4fdb12c108e0452366e8febd13632e SHA-1: 943badd5d1dd25d1d5405f96432fbef3df5e3373 SHA-256: 5d572a48c67c385f96f011b4d92baa179c1f61b9765e26b00461cfa869dba091
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, suggesting an attempt to lead the user to a malicious site. The document body, though partially corrupted, contains text that appears to be a lure related to search query answers. The presence of numerous embedded links, many pointing to benign files, alongside the malicious redirector, indicates a link farm strategy to obscure the malicious destination. No scripts were extracted, but the PDF structure itself facilitated the malicious link.

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.me/wix?keyword=say+it+with+symbols+3.2+answers
    • http://jozif.qslowsmoked.com/uploads/1/3/1/3/131398140/dadinelewonuj.pdf
    • http://kabuvid.bassetbuddiesrescue.org/uploads/1/3/2/3/132303168/muwexetise.pdf
    • http://files.oldetownemusic.com/uploads/1/3/1/6/131606486/8719247.pdf
    • http://kazerogo.bright-thoughts.co.uk/uploads/1/3/0/7/130739059/joxemig_ferabis_tewuzoduden_xagopap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2bf199d9-72f5-4eca-9191-c8e8e8a7199c.filesusr.com/ugd/e1d12c_fc2f2630078d42b087afa1d7cebdddbc.pdf?index=true
    • https://0eb56373-7697-4b48-bcaa-5dd5671b6bed.filesusr.com/ugd/76b6de_8b4449ec3d334c5dbc9c63fc2ebc58c1.pdf?index=true
    • https://580776be-5292-4b70-afe4-70df0dd43d0e.filesusr.com/ugd/d162e3_894f8682787a4e2394b2e9b986019c11.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0430/8749/5321/files/monopoly_cards_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/2023/0564/files/56483370995.pdf
    • https://cdn.shopify.com/s/files/1/0436/5457/8334/files/7821485415.pdf
    • https://cdn.shopify.com/s/files/1/0439/4234/6907/files/98491038151.pdf
    • https://4684c740-c4c6-4dbd-ab43-b97bb4ec597b.filesusr.com/ugd/33a16d_1827a23d4b5444f7bd060dad9d03f09e.pdf?index=true
    • https://46954b1c-1c8b-4814-add4-0da0658765c8.filesusr.com/ugd/3a38e0_1974619c7a5e4b91a7e794461a19cc17.pdf?index=true
    • https://4232cc19-1441-439b-9ccf-8c0fc9cea3f7.filesusr.com/ugd/3f80ec_88c8b107768f4827ad86567ad3088b06.pdf?index=true
    • https://438fb490-c876-4ce3-94af-503355d11e57.filesusr.com/ugd/54fa57_e67ea0f6f95342e2889e912654203233.pdf?index=true
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c0a.bin
01c5ae330d03932c8e481702df83f8328acf0175b3b9d2cbf46c01eec2cb94fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C0A 5692 bytes
font_01_sfnt_off00005f58.bin
bcb87a792d926411553d26f9823a236864e43113d20c47f637d3659acf9361f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F58 10096 bytes

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