Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca83d72c43fbb023…

MALICIOUS

PDF

63.3 KB Created: 2020-11-22 07:44:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 39c04bbbc077e276346adc3702c9bc7f SHA-1: 95d344479393cbd93a61dc80931742fb7cbc0bee SHA-256: ca83d72c43fbb023c2ff1f656a7f2fba76fb8d43c4e6121252b6f62e700c03b3
214 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 or potentially malicious domains, indicating a link farm or phishing attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to 'gettraff.ru', suggesting it's part of a malicious campaign. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/123?utm_term=camisas+de+vestir+sin+cuello In PDF document text
    • https://xezujexowesujol.weebly.com/uploads/1/3/4/5/134502134/sipixuzipiluje_dazumidaraz_fowofegivave.pdfIn PDF document text
    • https://sejusidanixaj.weebly.com/uploads/1/3/4/3/134374441/b8ce892e8.pdfIn PDF document text
    • https://bapadiwifujeki.weebly.com/uploads/1/3/4/0/134041393/12d62.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/firigugixujotov/52185067962.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6033dcd2-47ed-46c5-bd97-35b945642c77/eve_red_frog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8baa56e-951e-402f-b269-c0ed5e3253b8/stranger_things_google_home_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/captain_america_first_avenger_putlockers.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/sunrise_middle_school_website.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/4779027625.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/18706022507.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e11a8fc-ea2f-43f5-ae83-864151b658a8/dmv_bozeman_montana.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_off0000b7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B7 5048 bytes
SHA-256: a6fbeb7c97e32a656cd3efba82170902d7331abae602fec8084981b2eb2a663e
font_01_sfnt_off0000c8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CD 11800 bytes
SHA-256: 799243cf6eea0f5b297235a97f7b5e845d7e4e2824a889e76a4b773e71e2c570

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