Malicious PDF — malware analysis report

Static analysis result for SHA-256 448f42884f5feb95…

MALICIOUS

PDF

42.1 KB Created: 2020-10-31 17:53:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4fcf4d36f50cf830e2fd948a15ba4468 SHA-1: 3ce32e15c1e418fb31c6b49db7fd4819f15f63e3 SHA-256: 448f42884f5feb953fda31c3776d5cf1505d7945ceb34423c431ab0970fbbdf4
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to redirect users to external sites, with a critical heuristic identifying a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

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://gettraff.ru/strik?keyword=the+only+astrology+book+pdf In PDF document text
    • https://sabadefupi.weebly.com/uploads/1/3/4/3/134345863/3265402.pdfIn PDF document text
    • https://lepitosamodovax.weebly.com/uploads/1/3/4/3/134335454/6c626bd9a5ece9.pdfIn PDF document text
    • https://mitixofixomu.weebly.com/uploads/1/3/4/3/134333727/d4734c198eec25.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/zamalaroxe.pdfIn PDF document text
    • https://xawiwewediwo.weebly.com/uploads/1/3/4/0/134017039/juzifemopabopamevobe.pdfIn PDF document text
    • https://taxufizewafodo.weebly.com/uploads/1/3/4/4/134477277/mupilegotefi_fegejik_xukuwutowozito_sukumupebawuwa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3a6c66e2-f572-4e29-b0f1-ac7a90f3bd91/niro_kia_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bc26fe2-fcf7-4b24-8434-9f57f189ede1/95900180475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaf85aed-77e2-4dd8-96d3-ae3d75210e77/budano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1cb10df-7448-4942-bc3c-fb0466b23a58/28205490955.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db0562c9-2f3b-4f75-a5ff-1998ebc5787b/61420353324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31e5912c-d142-4513-8693-d93c9b988608/67968437390.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8059b165-f1cf-40d3-8922-42ed08e2b06c/96355919669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e7f8e19-23f4-421e-9431-ab19465d27a4/60444428177.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000589d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x589D 5296 bytes
SHA-256: 1e944b0871f7a957d09f606779808046236519258075aedd86e4c129b2f92d57
font_01_sfnt_off00006a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A9A 10156 bytes
SHA-256: 8cd8ff47a2a52fec9e7539c6d298b49511b965434196a81c85af59a85603aa0f
font_02_sfnt_off00008d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D57 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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