Malicious PDF — malware analysis report

Static analysis result for SHA-256 1537f4125f51fbc7…

MALICIOUS

PDF

42.2 KB Created: 2020-08-04 21:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf3c00e7121d65276cb282dd55a750b5 SHA-1: 6127513c14b585c1e34732aee5111080130cd6b6 SHA-256: 1537f4125f51fbc7ebe108345d7cf483ae5aba3a7c109cc1ca33e835c8587575
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains references to 'advanced javascript pdf' and the malicious redirector URL, suggesting an attempt to lure users to malicious content. The presence of many links, including those pointing to potentially compromised Shopify domains, indicates a link farm or distribution 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.com/pify?keyword=advanced+javascript+pdf
    • http://files.jenneymethvinlpc.com/uploads/1/3/1/4/131452903/b242c2fcf5c6e.pdf
    • http://files.quaysbarportrush.com/uploads/1/3/0/9/130969270/6336542.pdf
    • http://files.robertnschaeffer.com/uploads/1/3/0/9/130969932/folimerefop-xosil.pdf
    • http://files.primrosevalley.tv/uploads/1/3/1/8/131871864/8864347.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/4255/9384/files/wobevajezas.pdf
    • https://cdn.shopify.com/s/files/1/0435/8874/7423/files/56436226224.pdf
    • https://cdn.shopify.com/s/files/1/0434/5790/4792/files/15567574379.pdf
    • https://cdn.shopify.com/s/files/1/0437/8945/1425/files/50286566000.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44603331863.pdf
    • https://cdn.shopify.com/s/files/1/0429/5743/9129/files/64865130043.pdf
    • https://cdn.shopify.com/s/files/1/0431/2878/3002/files/57079214384.pdf
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/gemaluvumufebabema.pdf
    • https://cdn.shopify.com/s/files/1/0439/2045/7883/files/creo_parametric_4._0_tutorial_roger_toogood.pdf
    • https://cdn.shopify.com/s/files/1/0433/8889/5386/files/wujezatabekobaledomo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3475/4728/files/77173150078.pdf
    • https://cdn.shopify.com/s/files/1/0439/0617/1048/files/40172459293.pdf
    • https://cdn.shopify.com/s/files/1/0431/5791/3754/files/28214620532.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dadimutixiwukigojubiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/xujolidedipedusawid.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_off000066e3.bin
a98309ee90bddf96aa8a79ed820acec9b9f2619b2f1633861f436e8eed524752		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66E3 5240 bytes
font_01_sfnt_off000078d5.bin
3d5bc1de3542faa96ccdc64095e65b035b5937513c86c6f38267166042cfca48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78D5 10272 bytes

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