Malicious PDF — malware analysis report

Static analysis result for SHA-256 512e0b9253e67522…

MALICIOUS

PDF

38.9 KB Created: 2020-11-04 05:00:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4d12a08d90404a70c9c1857aa48b3b34 SHA-1: b61f2b1a7535ab5280fb7399f882e6c6bbf4b2d5 SHA-256: 512e0b9253e67522c48d58912372f97d3ae75b2db1ac71e1ec8f831ca4d8aaad
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure. The primary redirector URL is https://cctraff.ru/aws?keyword=the+born+losers+movie+cast, which is flagged as malicious. The document body, though heavily obfuscated, contains this URL and other links, suggesting a link farm or SEO poisoning tactic to drive traffic to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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/aws?keyword=the+born+losers+movie+cast In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417664/normal_5f9e1abc83686.pdfIn PDF document text
    • https://vapufubewadul.weebly.com/uploads/1/3/4/4/134485241/benukubufavudub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417528/normal_5f98d6e8a60ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407318/normal_5f9f1d6015c54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408479/normal_5f963151bfea0.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/900657f6-bf44-4509-a177-cc4a8c5aa368/audrey_assad_abide_with_me_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7b66586-4b45-442c-9642-b320f48e53f1/kuzabawezurosebosomanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bbbed3d-081b-4d1a-ad33-b0bc1d20a4b7/sovan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e441de2-3089-4a0d-b761-81236ba6788a/6094101094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92bbf498-0feb-4ec2-8695-63fdd6b4430a/vawirogudaporuvetolobexew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edf81305-1cb7-427a-8523-5b2eca1e52cb/zapoxosajovokajunogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7952651e-966c-4065-90ac-d65e5d40c164/62134445576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cc3dc15-b8c8-4578-b418-0f35ddea4ce3/78237233778.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12c59742-b9da-4265-8378-7472a6120171/puxozidafifikuveleben.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_off0000570c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x570C 5188 bytes
SHA-256: d7ebed70ec56d797f869fae90d5c82885bc614b575afcfbd951922480acd8582
font_01_sfnt_off00006887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6887 11272 bytes
SHA-256: b34d5e507cbfab2d1903e1cf11718d76f25fd7bdbff55a2ab5f794377de28a6c

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