Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b24dc61ffde04e1…

MALICIOUS

PDF

40.5 KB Created: 2020-08-19 19:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa54b1c9d66a7f7220dadff74eb11f52 SHA-1: 95a0f2352a4a37e6a64b5f59bf93a909d082dcc7 SHA-256: 1b24dc61ffde04e1272105f168e721ca21ad59688c602dfc2d4251da2e547801
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains text and embedded links that mimic a 'Calcutta university migration form 2019'. One of the embedded URLs, 'https://ttraff.com/pify?keyword=calcutta+university+migration+form+2019', is flagged as a malicious redirector. The document also contains a large number of links to PDFs hosted on Shopify, suggesting a link farm for SEO manipulation or to obscure the malicious redirector. The ML classifier strongly indicated maliciousness.

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.com/pify?keyword=calcutta+university+migration+form+2019
    • http://files.openmindimprov.com/uploads/1/3/0/7/130776611/4f7740.pdf
    • https://cdn.shopify.com/s/files/1/0435/8933/7256/files/machine_learning_for_beginners_python.pdf
    • https://cdn.shopify.com/s/files/1/0434/1799/3366/files/24960167466.pdf
    • https://cdn.shopify.com/s/files/1/0431/4172/6370/files/77273194077.pdf
    • https://cdn.shopify.com/s/files/1/0429/1048/2588/files/fivekarijex.pdf
    • https://cdn.shopify.com/s/files/1/0434/8785/4749/files/97863427058.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/2705690084.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85755015361.pdf
    • https://cdn.shopify.com/s/files/1/0435/2638/9912/files/93615614810.pdf
    • https://cdn.shopify.com/s/files/1/0437/0815/4008/files/zubixa.pdf
    • https://cdn.shopify.com/s/files/1/0436/5529/9237/files/anorexia_restrictiva.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_off00005f4d.bin
bdf195b88bf4d17febbefc6a9b9154c1b516c2a499c6339b419be2506a24c860		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4D 5748 bytes
font_01_sfnt_off000072de.bin
852b386b4e21edb1fd9e3ba6e8f44d2c819c878577acc42267934841706dce0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72DE 10192 bytes

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