Malicious PDF — malware analysis report

Static analysis result for SHA-256 e672c5409249a716…

MALICIOUS

PDF

67.2 KB Created: 2020-08-07 09:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f685457366b2dfa36ddac456f79638b5 SHA-1: 3b059d22feb8901d3eacddae4a8acfb20a92db18 SHA-256: e672c5409249a716a31cded7be0168a0926cb348185b676e29e479b3ab505610
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm with 30 external links, including a redirector to 'https://ttraff.ru/pify?keyword=arduino+programming+codes+pdf'. This indicates a malicious intent to redirect users to potentially harmful content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the PDF structure and embedded links are sufficient to infer a phishing or scam delivery mechanism.

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=arduino+programming+codes+pdf
    • http://files.stlvacancy.com/uploads/1/3/1/4/131407067/vilekuwapugu.pdf
    • http://files.thecookieencounter.com/uploads/1/3/1/8/131858661/fupedepux.pdf
    • http://tuzajir.serenalewis.com/uploads/1/3/1/4/131483200/nadabow.pdf
    • https://cdn.shopify.com/s/files/1/0432/5448/1054/files/legabejowuwelisobe.pdf
    • https://cdn.shopify.com/s/files/1/0428/8570/9987/files/ligukonoveniwibudiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16175378270.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3464/files/tetapa.pdf
    • https://cdn.shopify.com/s/files/1/0440/7335/3381/files/delasewasanoraxewojafol.pdf
    • https://cdn.shopify.com/s/files/1/0429/4773/9811/files/nozemim.pdf
    • https://cdn.shopify.com/s/files/1/0429/8348/9687/files/84810974172.pdf
    • https://cdn.shopify.com/s/files/1/0435/6990/5825/files/a_dream_come_true_book.pdf
    • https://cdn.shopify.com/s/files/1/0449/4861/9419/files/development_economics_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/9386/9223/files/zalulasavokezigazuloneg.pdf
    • https://cdn.shopify.com/s/files/1/0432/7299/4971/files/96750604313.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kuvesagapixunijibofalase.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/82191842179.pdf
    • https://cdn.shopify.com/s/files/1/0436/1102/9667/files/bases_de_datos_relacionales_y_modelado_de_datos.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb71.bin
dd1381a1dd5016576adff6425b4b951693979a999a4e79985dd36a484dd0d2bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB71 5432 bytes
font_01_sfnt_off0000cddc.bin
b1dac643d9f4d3fc2502af7d92f57d8281068709ee7242fe929a881253c497d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDC 15900 bytes

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