Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d5d8cca91790a7…

MALICIOUS

PDF

45.7 KB Created: 2020-09-05 15:39:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cff216baee74f16eb542bc0ffd1a1126 SHA-1: d9a2d9ff1562b7815312b297b66dfe8a8bc4f258 SHA-256: 86d5d8cca91790a7856d556bc82069b26dbf19002e13c3a7b8356c7408103b9c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one critical heuristic identifying it as a redirector to malicious infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a 'stone column design spreadsheet'. This suggests a phishing attempt to redirect users to a malicious site.

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=stone+column+design+spreadsheet In PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8509/3272/files/73935108070.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/5407/5799/files/imagenomic_portraiture_cs6.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3721/2319/files/guitar_scales_and_arpeggios_grades_1_5.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6400/8610/files/xobawabagusamed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5498/0507/files/14172160007.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9b33c5_d6b38862815446739660bb0450ae0a64.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c5d40f_1624923568a44055bca1771ade81bf52.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_7dc1e7c75da64ea387c052e73dbacdf2.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_79205009721042c7a088d05b4efaf80a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f7fbc8_f73bb66593974e01a928d72362fb5c3d.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8452/9310/files/2872138284.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3164/1762/files/teori_akuntansi_dasar.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5f5755_27d7fd141b8247d598c8d1ba4745f512.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a8c229_5056afc19e0e4b99a259d9207d596db6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_b98bb2402670435e9064fa46bdc5ad28.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E5B 1604 bytes
SHA-256: a90f79d35b855d6e419c922e1c16a7f20c875ed03b3e5f8d6d8c2638309ac592
font_01_sfnt_off0000667e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x667E 5592 bytes
SHA-256: 0b4dcb198009c710859eb99e65b9e35ce776a1858dba991998a9f7653aee15fa
font_02_sfnt_off00007950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7950 15468 bytes
SHA-256: 90756b1afa416c4e05b2301826588d63fafb03d1761128d821a1063c3b8e8f1b

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