Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda5c600845c4706…

MALICIOUS

PDF

52.5 KB Created: 2020-09-02 07:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4e37c8300c9d5fe5f888f33b0e563c59 SHA-1: 2f8a906a62a390eccfd6aed38429546a4cd5e9cd SHA-256: bda5c600845c47066553470f238bc8948de99f7c7e46bfcae8c00ea2d9a0913d
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, ttraff.cc, which is disguised as an educational worksheet. This indicates a phishing or malware distribution attempt. The ML classifier strongly supports the malicious verdict. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent.

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=graphing+quadratic+inequalities+in+two+variables+worksheet In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_f4843aa582a3463291dd97b726cdc813.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/7198c1_0a1ba8b33d634c9d9bc6cb43fff9aaa7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3f0e57_72cbf9d8249f46e4a8f5409fb108d026.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/33ab24_d1f2b4778ff54ea5b351e91961494905.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/77eba6_ebe694557dc44932a7445603fb7187e3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/mathematical_logic_class_12_commerce.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4681/3344/files/internal_and_external_validity_in_quantitative_research.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5814/2120/files/90672813888.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4473/2065/files/80421497043.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/6318/2247/files/mettre_une_image_en_arrire_plan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1921/4756/files/namibuson.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2408/0282/files/70132748752.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9063/2101/files/dobemijejurew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4907/3312/files/dewevekuwelakojoteme.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8364/5599/files/38215968401.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0632/7959/files/51210790441.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000799e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x799E 5848 bytes
SHA-256: fdfee75e4773f4e9d2d680d43945c83570220ab404bbbc48e1f4450659a18706
font_01_sfnt_off00008d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D91 16568 bytes
SHA-256: 2388b470d0f986dfaa6df31ec22096201eb2f15888796d36fb05b75786273a84

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