Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef6877460229ce4…

MALICIOUS

PDF

44.5 KB Created: 2020-08-14 18:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d95b9f8de582e9f4fec2b81667d0c83 SHA-1: e9d609ef4457bc6ba5fdedabad94fff506283d26 SHA-256: 0ef6877460229ce4797033193ec9f11f4bbb1f825ebf2b85268c1b22b193c8d5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=binary+to+hexadecimal+conversion+worksheet'. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous external links and the identified malicious redirector strongly suggest an intent to lead the user to malicious content, likely for phishing or malware delivery.

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.ru/pify?keyword=binary+to+hexadecimal+conversion+worksheet
    • http://kovine.ristorantepizzeriacasamatta.com/uploads/1/3/0/8/130874666/6303709.pdf
    • http://files.jessicapiombo.com/uploads/1/3/0/7/130775076/29ee3a6b0f.pdf
    • http://files.genathomas.com/uploads/1/3/1/4/131438667/dugawivowadonar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3853/9927/files/guwutiloxopizapazigasu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4546/9858/files/88788282318.pdf
    • https://cdn.shopify.com/s/files/1/0437/8509/3272/files/health_marketplace_form_1095_a.pdf
    • https://cdn.shopify.com/s/files/1/0435/7249/4495/files/calendrier_2020_et_2020_tahiti.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7962/files/fubafidozidofak.pdf
    • https://cdn.shopify.com/s/files/1/0435/5896/1315/files/69596412857.pdf
    • https://cdn.shopify.com/s/files/1/0439/1606/6971/files/junikexawefebolafu.pdf
    • https://cdn.shopify.com/s/files/1/0439/9611/9198/files/lowatalerakegetupebabo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2571/8678/files/12173078604.pdf
    • https://cdn.shopify.com/s/files/1/0433/5802/7928/files/68100346315.pdf
    • https://cdn.shopify.com/s/files/1/0433/2368/7067/files/81938391138.pdf
    • https://cdn.shopify.com/s/files/1/0430/8526/7097/files/wujutefujaxoturodidugusez.pdf
    • https://cdn.shopify.com/s/files/1/0437/5022/8119/files/solving_circuits_with_capacitors_and_resistors.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000714a.bin
25b7c3e9ada64befc41cba0c4c6dee086f2af2dfed8ff24bc74766241c7f1573		 pdf-font-stream PDF embedded font (sfnt) at offset 0x714A 5612 bytes
font_01_sfnt_off00008447.bin
4a964be55a08eac108b97eb34147355a7c112ba1a8552d64ee96ffb1d9cadb86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8447 9552 bytes

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