Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad52945407630c8d…

MALICIOUS

PDF

48.9 KB Created: 2020-07-22 12:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5b04ec0db023114485a9dfb19ce102d SHA-1: 5dcce057eb54b912b5be0e144b9a42c33d847aea SHA-256: ad52945407630c8d13350599926234cc709642a15e30fa5e5ad114043c93bce5
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating it's a malicious redirector link farm. The primary malicious URL identified is ttraff.ru, which is used in conjunction with keywords suggesting a lure for interview questions. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and 'instrument technician interview questions pdf', reinforcing the lure. The ML classifier strongly indicates maliciousness.

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/wb?keyword=instrument%20technician%20interview%20questions%20pdf
    • http://files.healthysmiles4you.org/uploads/1/3/1/3/131378771/44f77.pdf
    • http://files.makingmathmagic.net/uploads/1/3/0/8/130874266/zaziwuvusede_naseguvixaf.pdf
    • http://files.innov8tion.ca/uploads/1/3/1/3/131398367/93cc6ede.pdf
    • http://files.cozykidsembroidery.com/uploads/1/3/1/4/131409170/ninebafakafekip.pdf
    • https://cdn.shopify.com/s/files/1/0429/6366/5062/files/27278060814.pdf
    • https://cdn.shopify.com/s/files/1/0436/1791/0941/files/2917599928.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9157/files/26965087707.pdf
    • https://cdn.shopify.com/s/files/1/0432/5706/9721/files/dinezajujenujajuz.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/sokapujido.pdf
    • https://bilivogeji390496675.files.wordpress.com/2020/06/51961899989.pdf
    • https://wenajaxapat.files.wordpress.com/2020/07/bezopawulelese.pdf
    • https://tifavafus.files.wordpress.com/2020/07/10568420952.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/4117849179.pdf
    • https://cdn.shopify.com/s/files/1/0434/2926/5564/files/98660282440.pdf
    • https://cdn.shopify.com/s/files/1/0431/5008/2202/files/99324404386.pdf
    • https://cdn.shopify.com/s/files/1/0436/3422/9398/files/80003436940.pdf
    • https://cdn.shopify.com/s/files/1/0432/4445/4056/files/40744250229.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/34729076910.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/xajorewagopawopikofovebef.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/luzufexima.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_off00007f89.bin
239a03e999cdc11e208259d64d1e7588293928eaa88e73bd2e11366a1489cb64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F89 5460 bytes
font_01_sfnt_off000091f2.bin
d0d8dd8d4293b8c1c85b5e50f3e3ffa7a4d6ba5e7c5f17ecebcbd5dbca678df1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91F2 10416 bytes

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