Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb21c4359904c949…

MALICIOUS

PDF

38.3 KB Created: 2020-08-24 17:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee02d915fdd9fe5182440465aa7197e8 SHA-1: 45029f02dcc6a8322345a5fbbbcd4f8966f452d5 SHA-256: bb21c4359904c949220dd254065cb84edf331acaf57ad1142525b938306d119e
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Lego marvel super heroes android gratuito' and a URL that appears to be part of a link farm designed to attract traffic. The presence of a malicious redirector and the link farm strategy suggest an attempt to drive users to potentially harmful content.

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=lego+marvel+super+heroes+android++gratuito
    • http://lewuxoz.michellehynes.com/uploads/1/3/1/4/131408899/2133801.pdf
    • https://cdn.shopify.com/s/files/1/0436/3422/9398/files/91851528898.pdf
    • https://cdn.shopify.com/s/files/1/0432/9344/2208/files/aggreko_plc_annual_report_2011.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4632/files/vonets_vap11g-_300.pdf
    • https://cdn.shopify.com/s/files/1/0461/7450/3065/files/admin_template_free_for_asp._net.pdf
    • https://cdn.shopify.com/s/files/1/0437/2371/8805/files/25593327245.pdf
    • https://cdn.shopify.com/s/files/1/0434/6078/8390/files/tukenoruvu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/7360904662.pdf
    • https://cdn.shopify.com/s/files/1/0437/2309/6216/files/19180480555.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048ec.bin
b402b4ead537b282a49d275c07ed6327f20fe3732071c0f508b17019e6ae67f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48EC 5256 bytes
font_01_sfnt_off00005aa7.bin
fca6a5e55e32f57fd4e1fc56464218f9fc8412a5ae9cd413e5d344a9b20dd8a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AA7 9896 bytes
font_02_sfnt_off00007c86.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C86 4324 bytes

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