Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f9ecb661909373…

MALICIOUS

PDF

38.0 KB Created: 2020-08-30 21:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd406a3a39b648ea2d688a1e9e847ec5 SHA-1: d704a6cf25970b0f65f6bd07e3aa28909a4b9e0f SHA-256: 68f9ecb6619093735e4ba7ed739b027b26a2580d1d003422dc00960b558de6e6
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, flagged as a link farm, directing to a known malicious redirector. The primary malicious URL identified is https://ttraff.ru/wix?keyword=perdona+pero+quiero+casarme+contigo+repelis. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious content. The ML classifier strongly supports the malicious verdict.

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/wix?keyword=perdona+pero+quiero+casarme+contigo+repelis
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4436/4710/files/mavigoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/8304/6813/files/89692573256.pdf
    • https://cdn.shopify.com/s/files/1/0437/9515/3058/files/somaxul.pdf
    • https://cdn.shopify.com/s/files/1/0432/4678/0566/files/vupowokotesizulinefox.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xarapidarobumebavo.pdf
    • https://static.usrfiles.com/ugd/9cc572_e3e42f034f31497b9314ad4e13c647a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_7ecafe7353ed4ead9ff7b02385f5eb06.pdf
    • https://static.usrfiles.com/ugd/b8c837_70961a14e05f4d12a2d9443d7faf2da3.pdf
    • https://static.usrfiles.com/ugd/a86d68_5882fb6d33e24522ad69eb0a355d40e5.pdf
    • https://static.usrfiles.com/ugd/b8c837_9205e142f72a4937a5e236e07320cc8b.pdf
    • https://static.usrfiles.com/ugd/e3c460_d0d5d238c4f446f395d556c10d4368c2.pdf
    • https://cdn.shopify.com/s/files/1/0433/8843/6643/files/miwufunuvafelawekopuka.pdf
    • https://cdn.shopify.com/s/files/1/0439/1016/8744/files/99685068223.pdf
    • https://cdn.shopify.com/s/files/1/0432/8318/5832/files/15303705382.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5362/files/rulumebekovajulugu.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_off000053dd.bin
c5177b2d986447170169912f1f7ad9612e590e62fdcc71b2bbb061d476f95511
pdf-font-stream PDF embedded font (sfnt) at offset 0x53DD 5520 bytes
font_01_sfnt_off0000667c.bin
0f1c9d7b39e4e2604de87ff2d950eb492b98115e52913c4b4e1355fe69ca259e
pdf-font-stream PDF embedded font (sfnt) at offset 0x667C 10760 bytes