Malicious PDF — malware analysis report

Static analysis result for SHA-256 644159da96b47041…

MALICIOUS

PDF

49.2 KB Created: 2020-08-31 15:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24e6b75138387f4ce67d7d35793c1739 SHA-1: 21dbb3a1febe43142ecc16e740bfe1c665d5d942 SHA-256: 644159da96b470412d26ef32f53a7b8e25b5ef34daf28726b476bac38237beb7
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/wix?keyword=the+heart+and+circulatory+system+worksheet', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to a worksheet and the malicious URL. The presence of numerous external links, many pointing to PDF files, suggests a link farm or redirection scheme designed to obscure the ultimate destination.

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=the+heart+and+circulatory+system+worksheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_447a6753bb234add81661ee07112d95c.pdf
    • https://static.usrfiles.com/ugd/8ab72e_335000ef748b4d3fa1bc356418af289e.pdf
    • https://static.usrfiles.com/ugd/b8c837_012c1a48c59c4d30b027a1d7a6c9ffdf.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a8d43fb5b1f4ea78bc5b0cdb0e68b95.pdf
    • https://cdn.shopify.com/s/files/1/0437/0392/6952/files/40692767227.pdf
    • https://cdn.shopify.com/s/files/1/0437/2480/0154/files/vupisir.pdf
    • https://cdn.shopify.com/s/files/1/0434/6285/2761/files/lowes_greece_ny.pdf
    • https://cdn.shopify.com/s/files/1/0432/8099/0366/files/5130330873.pdf
    • https://cdn.shopify.com/s/files/1/0431/6889/1040/files/gojedukuvexasiporuluserip.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd536a2a81474067928e9b4219d4662d.pdf
    • https://static.usrfiles.com/ugd/8acad3_0202ecaf9efc4d86b3cd4c298604b5fd.pdf
    • https://static.usrfiles.com/ugd/b8c837_1398ee65aaa34f92b29ee2abb46b524d.pdf
    • https://static.usrfiles.com/ugd/9374a7_b876e3869e99418d8290b43ff9cb37ea.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006056.bin
10d4f782fb63abf20986ef7e06fc1b6e24c68cd3fbc0100d1e5a8bd047d04ab2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6056 5268 bytes
font_01_sfnt_off00007222.bin
e597c83019aef0b3549a7ef3610ffa1ac3582c907e388b521ee47f18ec5a8711		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7222 10052 bytes
font_02_sfnt_off00009430.bin
c8cad0fcbf711734ba90d1bf0f33d5774ae0d43a5fc07b95f2d0d23150af1919		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9430 16088 bytes
font_03_sfnt_off0000a8f2.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8F2 4324 bytes

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