Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3dda61ec15ffec…

MALICIOUS

PDF

67.8 KB Created: 2020-11-25 09:20:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c861f5b0cb661fef0fd35f9886fdc64a SHA-1: ed86b8a7901d1907dbe74efd9edd86b59c4d1332 SHA-256: 4c3dda61ec15ffece4e3c23966325b1807443fd88cfac1311a96ba334994dfea
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One critical heuristic identified links to known malicious redirector infrastructure, and another flagged the document as a link farm. The embedded URLs, such as 'https://gettraff.ru/strik?utm_term=skyrim+best+weapon+enchantment+for+assassin', are likely used to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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?utm_term=skyrim+best+weapon+enchantment+for+assassin In PDF document text
    • https://moguvikob.weebly.com/uploads/1/3/0/8/130874292/vuxubofowa.pdfIn PDF document text
    • https://davobudo.weebly.com/uploads/1/3/4/4/134432622/xefakibufikikoj.pdfIn PDF document text
    • https://federadedeladol.weebly.com/uploads/1/3/4/6/134626130/951eb7.pdfIn PDF document text
    • https://gewosawoma.weebly.com/uploads/1/3/0/7/130739201/b38f25357399.pdfIn PDF document text
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/zumuxojezudag.pdfIn PDF document text
    • https://bumenabizobopum.weebly.com/uploads/1/3/4/4/134462968/8e37fa.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/getizar/escape_alcatraz_mod_apk_1._4_0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c66abbdb-7c47-4b2f-baaf-3932f77b57e1/40165874883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/496f7989-0ecd-4f6c-b1f2-080e94958141/nazomowokozukujuse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a69651ae-dfb1-4644-9ef9-162a4ba187d1/22399021849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/469833d3-a122-4955-88f4-d050da387703/80420098275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/561161de-206b-4469-af65-623997127823/mitexufubumipifuperem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/646f21c0-721d-461a-962d-4fcd49847faa/tufifisej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b810f41-87f5-420c-bf12-5c7795dd9eeb/28957541380.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_off0000c982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC982 5724 bytes
SHA-256: a6f6524b875a65be9caed15d1d8721c98dd5681f6bce69b0ba69b22d996bb5bd
font_01_sfnt_off0000dceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEB 10592 bytes
SHA-256: 2d8650f21a0ad33384daccfae0db0ac035713bd39c8e06e9124fd46529d69f67

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