Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e7dd543121c060…

MALICIOUS

PDF

50.0 KB Created: 2020-08-02 21:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b899024baeb142dff3d6e66c87f094f7 SHA-1: bacbcaef0029fef264a2b9cf8c016bc4db98be6f SHA-256: 75e7dd543121c060bb3f7cce65d307039ddce58e617021a4c32a63b85e9ecea7
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially malicious redirectors, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'how to remove metadata from pdf' and a URL that appears to be a redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of many external PDF links suggests a link farm or SEO poisoning tactic, likely to drive traffic to malicious sites.

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=how+to+remove+metadata+from+pdf
    • http://files.yellowbirdnestweddin.com/uploads/1/3/0/8/130813988/938556.pdf
    • http://files.neoshirtco.com/uploads/1/3/1/3/131380001/c2eb69724c.pdf
    • http://files.communitymanagers.net/uploads/1/3/0/7/130775528/6181916.pdf
    • http://files.ragsboutique.org/uploads/1/3/1/4/131482954/nosorel-kigadapadibozij.pdf
    • http://files.melissachuang.com/uploads/1/3/2/8/132814468/mapagutobo-gowimipimejeju-sasexunakenamow-takuva.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/4684/4054/files/mamujusebekeridoxera.pdf
    • https://cdn.shopify.com/s/files/1/0430/4008/0021/files/49783968700.pdf
    • https://cdn.shopify.com/s/files/1/0431/4287/3249/files/5120634705.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2906/files/77083210891.pdf
    • https://cdn.shopify.com/s/files/1/0431/9238/5700/files/66971201031.pdf
    • https://cdn.shopify.com/s/files/1/0430/7560/0535/files/tidovisoxuboboleruzul.pdf
    • https://cdn.shopify.com/s/files/1/0432/2859/4336/files/vojosepij.pdf
    • https://cdn.shopify.com/s/files/1/0433/4718/1718/files/xadesuzukoga.pdf
    • https://cdn.shopify.com/s/files/1/0429/7854/1722/files/25892816646.pdf
    • https://cdn.shopify.com/s/files/1/0431/6135/4389/files/96196503337.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/vt_dmv_license_renewal.pdf
    • https://cdn.shopify.com/s/files/1/0428/3950/7100/files/55280256697.pdf
    • https://cdn.shopify.com/s/files/1/0430/4168/5665/files/all_car_brands.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007785.bin
6e89b72779218759e679601e0596a94412242594a85a226b69cf48c3777ada2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7785 4724 bytes
font_01_sfnt_off000087a4.bin
6ec66912d9a034b2b15aa036a831c626b5721f3b18c67ac8b284305fdbde5698		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87A4 10716 bytes
font_02_sfnt_off0000ac35.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC35 4324 bytes

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