Malicious PDF — malware analysis report

Static analysis result for SHA-256 353a1c3e6e27ad7b…

MALICIOUS

PDF

47.3 KB Created: 2020-10-28 07:02:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1383250c4e180607f9958e927eebdb64 SHA-1: 1eed8dc15aaa34bfcf6f3e9a305bbb0f773781fd SHA-256: 353a1c3e6e27ad7b56fb82f47955ad552cd0425c1af738c83a446a0853345e09
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external sites, including a known malicious redirector. The primary lure appears to be a link to 'what is the somatic nervous system quizlet', which redirects to the malicious domain cctraff.ru. This suggests a phishing or scam attempt designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://cctraff.ru/123?keyword=what+is+the+somatic+nervous+system+quizlet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382974/normal_5f91a1460f15e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368503/normal_5f8ae6a153f59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368245/normal_5f8b73adb0d48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379964/normal_5f98eb0ccfc22.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/894664.pdfIn PDF document text
    • https://bitekiparoduj.weebly.com/uploads/1/3/4/0/134017536/6916bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387703/normal_5f962a060d01d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369936/normal_5f8c064b6b0cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379385/normal_5f8ceea1db4fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368227/normal_5f89bfb48fff3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366308/normal_5f8c5a2b2fd34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378171/normal_5f8a4309a129e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416319/normal_5f98b1b809017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388426/normal_5f90a6caaae8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385216/normal_5f8d9c6e27217.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/1/0478/1791/6575/files/97345522290.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/6424/8470/files/fullscreen_browser_android_app.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/xefuk.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/crystal_chandelier_chords.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_off00007a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A34 5388 bytes
SHA-256: 65b27110ceb9876142bcbc2fa94a810416a6023626b9e2c7b3c5705c054cc9c2
font_01_sfnt_off00008c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C80 10404 bytes
SHA-256: 7091b5b80b69419036d05ab516ea5445e9e6767ed92d2c5309c5883ea27d144d