Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a09c35bd192c4d…

MALICIOUS

PDF

42.3 KB Created: 2020-10-07 18:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f7f915a18e98a2d76328a17f1c6af728 SHA-1: 5fc1e53c77a6f915e49850b70a7de64444790b27 SHA-256: 02a09c35bd192c4dd37b9d9c1e8b56960a92dc190383618bfaa49db928a20518
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded links, identified as a link farm and a redirector to malicious infrastructure. The document body, though partially corrupted, suggests a lure related to an 'answer key', aiming to trick users into clicking these links. 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://gettraff.ru/strik?keyword=section+3+guided+reading+and+review+answer+key In PDF document text
    • http://files.thisisitbe4thefire.com/uploads/1/3/2/7/132710624/wuvuzuzukaromi.pdfIn PDF document text
    • http://files.samerhatam.com/uploads/1/3/0/7/130776542/lixidom.pdfIn PDF document text
    • http://files.missysmagicstyles.com.au/uploads/1/3/1/4/131406036/3100047.pdfIn PDF document text
    • http://tupak.codamidwest.org/uploads/1/3/1/4/131405997/8c6e9444bf4.pdfIn PDF document text
    • http://rujirav.postsustainabilityinstitute.org/uploads/1/3/1/3/131398540/momodig.pdfIn PDF document text
    • http://giluxoge.carvedanatomy.com/uploads/1/3/0/8/130814328/a1a0ff8f2337.pdfIn PDF document text
    • https://site-1037071.mozfiles.com/files/1037071/wuzanegibikigap.pdfIn PDF document text
    • https://site-1043908.mozfiles.com/files/1043908/fomegidaju.pdfIn PDF document text
    • https://site-1036812.mozfiles.com/files/1036812/76655327260.pdfIn PDF document text
    • https://site-1044146.mozfiles.com/files/1044146/23002567334.pdfIn PDF document text
    • https://site-1037204.mozfiles.com/files/1037204/6689691640.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/9017/4886/files/womekinatatetoxewovifujoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1154/4987/files/50154428886.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/1748/1635/files/27844662176.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5520/0918/files/orange_hill_restaurant__events.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64A6 5660 bytes
SHA-256: a1655cb44feb2562cb566954ceba02909936e1c09c8a4c0dbf7e66bdcc48d77c
font_01_sfnt_off00007816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7816 10620 bytes
SHA-256: 8b13fafb29f186a74b9119d72bb2c78e18650d83e354de6b2e4cd33f238a5a68

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