Malicious PDF — malware analysis report

Static analysis result for SHA-256 eccaa21f505adaeb…

MALICIOUS

PDF

39.1 KB Created: 2020-10-30 07:41:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d2b8db166d1934dda856bac4df4cee9e SHA-1: 35cac8ca600dc430c79fb2372b4260ca47697935 SHA-256: eccaa21f505adaeb67e7247250516f7c0b5a515801c05cea50531fbfd104cdb8
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector and an SEO link farm. The primary malicious URL identified is https://ggtraff.ru/123?keyword=grizzly+bear+5e, which is likely used to redirect users to phishing or malware hosting sites. The document body, though heavily obfuscated, also contains this URL, reinforcing its role in the attack. No scripts were extracted, but the extensive linking suggests a phishing or content-scraping lure.

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://ggtraff.ru/123?keyword=grizzly+bear+5e In PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/9639692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379221/normal_5f8f91585928a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370541/normal_5f97fc293a81f.pdfIn PDF document text
    • https://visufevulun.weebly.com/uploads/1/3/4/3/134310134/xunowuguzek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_5f87fd78d9a83.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/137d6ba6-fc6d-4aab-80ca-487cffa78a9c/vapobawuluzogo.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/purejelatuditubuvesoviz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1420da89-c435-4f17-8981-a40238d24e5f/sikotuvifiveneguwub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/040815de-e958-4728-9c46-7941fbf27844/9528901133.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c597bb7b-3221-4911-b2f9-73b8fa06e020/seleno.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/katugunarugizanukodiv.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/crash_course_algebra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c729ae9-0d78-459b-a1a4-b32530770676/15910588215.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

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE9 4948 bytes
SHA-256: 6bcd6e71f28c9437237995534db1e4b8d53a28ae8ab3b9914686096beb4b5651
font_01_sfnt_off00006de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE5 9980 bytes
SHA-256: 6b48ed07839c66c761e9754fc05cd168a464dfa17decea6a1aa26bf19a119887

Open this report in the interactive analyzer, or submit your own file for analysis.