Malicious PDF — malware analysis report

Static analysis result for SHA-256 e60ff040eea3a4f8…

MALICIOUS

PDF

45.9 KB Created: 2020-11-02 18:16:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bf6319b14d14d8c6172dd802be6ab3ef SHA-1: 3b78bf44318760c2327fa77d31a4f37934cdc527 SHA-256: e60ff040eea3a4f85e5d53a39886839075a9a01369c2e28826ef05a7ad123c26
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, suggesting an attempt to drive traffic to malicious infrastructure. The embedded URL and the document body text both point to the same suspicious redirector URL, which is likely used to deliver a second-stage payload or phish for credentials. The ML classifier strongly supports the malicious verdict.

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=gillian+flynn+sharp+objects+review In PDF document text
    • https://suludizivot.weebly.com/uploads/1/3/1/3/131383823/wopab-nanonox.pdfIn PDF document text
    • https://totixibepetuter.weebly.com/uploads/1/3/4/3/134345693/4098444.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/lufujizokejoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60f4628d-3d89-44ee-8509-e39731305bb1/48407542321.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/ancient_hebrew_alphabet_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/fozatotunadugededu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/3227/0789/files/samajuxarimazi.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/libro_incoterms_2010_camara_de_comercio_internacional.pdfIn PDF document text
    • https://s3.amazonaws.com/kugufitel/gegikofitepokavisesaju.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/amulet_book_2_full_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1758/2230/files/mumupu.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_off000073f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73F7 5604 bytes
SHA-256: 15c68a955e4f411d684eb32f2fc09fb5109280cfb43823180860b052f95ef7d2
font_01_sfnt_off00008725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8725 10516 bytes
SHA-256: dedf197f849b7fec37f3d35c35b861a9d325f5573005ce1eae29e0bc63c282f4

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