Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb5e7fb01fb2c79…

MALICIOUS

PDF

41.9 KB Created: 2020-09-01 22:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e85358f9836218f712b44a7dca0aa763 SHA-1: 3cd9a4d3fc6801a983d52b8811ad10fba2ca34ac SHA-256: 4fb5e7fb01fb2c79b362b10b3b9ba3655a60d745131df106dffcbc1fb8a4921d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious link, https://ttraff.cc/wix?keyword=arena+simulation+software+free++windows+10, is designed to lure users into downloading potentially malicious content by masquerading as a software download. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/wix?keyword=arena+simulation+software+free++windows+10
    • https://cdn.shopify.com/s/files/1/0430/6649/1041/files/mikamusubijagute.pdf
    • https://cdn.shopify.com/s/files/1/0458/0799/2998/files/farscape_complete_series_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tefabojukiva.pdf
    • https://cdn.shopify.com/s/files/1/0434/4119/3110/files/golazatodid.pdf
    • https://cdn.shopify.com/s/files/1/0431/9982/4032/files/xupemered.pdf
    • https://static.usrfiles.com/ugd/3de8a6_640bff8220da433cb91b521415d84f02.pdf
    • https://static.usrfiles.com/ugd/b8c837_c48b819a10ad4545aa8b515cefbe50bf.pdf
    • https://static.usrfiles.com/ugd/122077_77425d7f75444e51b6a15240b9136e3f.pdf
    • https://static.usrfiles.com/ugd/0bcf16_52bcea4c45ba4cecb49aaf3da3970b05.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b36690e44f14102b07a6aeeb259cabf.pdf
    • https://static.usrfiles.com/ugd/145364_570ea0bc04bf46afa0dc0d634813a590.pdf
    • https://static.usrfiles.com/ugd/f84671_28dff64321c14782b105f8b095539a04.pdf
    • https://static.usrfiles.com/ugd/69695d_cbf87363735e41f1b2eb021470c54501.pdf
    • https://cdn.shopify.com/s/files/1/0440/3511/3110/files/84945196114.pdf
    • https://cdn.shopify.com/s/files/1/0431/4103/8229/files/84017707396.pdf
    • https://cdn.shopify.com/s/files/1/0428/7276/6630/files/49754262236.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_off00006414.bin
b4d6880a9badedcc217c7137897647b7056eacf9b17f8d8aa04bde8fe67cb9f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6414 5328 bytes
font_01_sfnt_off00007631.bin
fd583e496296ab60c2ec7a9221c24d92295c86cdaf268bb6d4e39a500338aab7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7631 10720 bytes