Malicious PDF — malware analysis report

Static analysis result for SHA-256 640b9beca91e2134…

MALICIOUS

PDF

47.1 KB Created: 2020-09-02 15:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afde292442ae182aa52e36e98d8f05ae SHA-1: cd587e9d410fe4c595967e4f400f86467cc8e26e SHA-256: 640b9beca91e21347bd783d0dcb0ecc2a683163a2ccf943ba4a989fcf1528c72
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting it is an annual report, likely a lure to encourage clicks on the malicious link. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs supports a phishing or redirection attack pattern.

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=darco+water+technologies+annual+report
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/353d00_f4c6c724b44f40b496c1f83a043ebaca.pdf
    • https://static.usrfiles.com/ugd/35c6e2_866621eb692148c8a018b403d9759de4.pdf
    • https://static.usrfiles.com/ugd/739437_b67992eac94248afa3ebbdf8f1a42f7b.pdf
    • https://static.usrfiles.com/ugd/b8c837_589de52ea5fd4b389f9746c48308f888.pdf
    • https://static.usrfiles.com/ugd/f46427_116cb45b7cea4329b5664ed0c7394246.pdf
    • https://cdn.shopify.com/s/files/1/0431/5509/5716/files/ate_ve_su_indir_apk.pdf
    • https://cdn.shopify.com/s/files/1/0436/0405/0084/files/management_accounting_question_paper_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/84885437304.pdf
    • https://cdn.shopify.com/s/files/1/0440/6929/0149/files/kolurinamopaxefawomope.pdf
    • https://cdn.shopify.com/s/files/1/0438/6134/4406/files/6th_grade_worksheets_on_adverbs.pdf
    • https://cdn.shopify.com/s/files/1/0434/7746/7288/files/55428505842.pdf
    • https://cdn.shopify.com/s/files/1/0432/5415/3371/files/w3schools_bootstrap_form.pdf
    • https://cdn.shopify.com/s/files/1/0437/4829/4807/files/how_much_does_smartsheet_control_center_cost.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6004/files/1489975100.pdf
    • https://cdn.shopify.com/s/files/1/0431/5761/8850/files/ruduv.pdf
    • https://cdn.shopify.com/s/files/1/0431/2442/4853/files/pugutuvi.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_off00006f59.bin
ba063b47c3e2b24ad9f603cb4e2d942cc8093a844d25e15d814f79c871f6c5aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F59 5284 bytes
font_01_sfnt_off0000816d.bin
ae570fc39a4e17bb50f8d405c085d3f7d59112e9fec90949d93f7eb429d9dd09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x816D 14928 bytes

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