Malicious PDF — malware analysis report

Static analysis result for SHA-256 c851208456cf131b…

MALICIOUS

PDF

40.8 KB Created: 2020-10-31 10:43:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cd3b2fd3d3e477197afa91d7b4784b74 SHA-1: 90651014c52dd35a6cad85b1cb8e699356825688 SHA-256: c851208456cf131b69dee1ceb44d391faa6b076298c45a1e19f4f41aa3c38606
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple embedded links, with critical heuristics identifying it as a malicious redirector and part of an SEO link farm. The document body, though heavily obfuscated, contains URLs that are flagged as malicious or unknown. The primary malicious URLs identified are ttraf.cc and a weebly.com hosted PDF, suggesting a phishing or malware distribution attempt.

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://ttraff.cc/123?keyword=conversation+gambits+in+english In PDF document text
    • https://tiposowa.weebly.com/uploads/1/3/1/1/131164246/javadosefo_ramobogoledanid_guwas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5f87136c660c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368501/normal_5f8fff011f356.pdfIn PDF document text
    • https://dodafuwunolig.weebly.com/uploads/1/3/4/0/134016835/026654ef27.pdfIn PDF document text
    • https://besuxape.weebly.com/uploads/1/3/4/3/134374749/5681882.pdfIn PDF document text
    • https://nosadipopone.weebly.com/uploads/1/3/4/4/134470180/tikixekodef-majudifenu-nibupubomutuge.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/f10ed957-3fd1-42cf-a9a1-6e748fd935c7/71986823997.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/537817d2-81b8-435c-8881-e34e03e83655/gubowuzorumomugopusemosa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0309/1872/files/android_app_read_text_aloud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f18bd90-f337-4266-875e-340915975e75/11821081748.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcd68ead-665d-40c2-b05c-33f08a0e17e6/robebujigikikuwip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/9054/0194/files/61562521084.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2277/4180/files/7th_grade_literature_book.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 8

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_off000062d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62D3 5204 bytes
SHA-256: b53688548b64d5feeb23f0650ce8ccb214b52d5a41062570188bbdb553ef8507
font_01_sfnt_off0000745a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x745A 10024 bytes
SHA-256: de1a8e0bd03367926c355b578a90d99f15f93cf5e286e3d496792790afa01e78

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