Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b21a3c546e450f…

MALICIOUS

PDF

42.6 KB Created: 2020-11-04 14:07:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f26e9a64c36753b68441238ecf972492 SHA-1: 2d41ba4ae8a294b3820e4205ec504912edc29435 SHA-256: 24b21a3c546e450f98b38439ca7ec3b0b416e8ce5dc320481c8118314e00c79a
174 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a QR-code lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ggtraff.ru/strik?keyword=embroidery+dst+file+format In PDF document text
    • https://roninuvanajeg.weebly.com/uploads/1/3/1/3/131379749/zoramazoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374954/normal_5f8db82bc9794.pdfIn PDF document text
    • https://zulatikuwa.weebly.com/uploads/1/3/0/7/130776211/8853440.pdfIn PDF document text
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/f981a0edcf09.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/pexodugosa/girdle_open_bottom_walking.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/futerikoxenupaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f87258c-da60-4057-919a-1c5cdc22d074/96055845746.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/9013551594.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/aranjuez_guitar_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/91886638596.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/petexuk.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/adobe_illustrator_compatible_file.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6808 5252 bytes
SHA-256: d1835f0f322fff6bceaa2339728dac1124e832528a68d576a2dfde8342acead9
font_01_sfnt_off000079d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79D4 10696 bytes
SHA-256: d600edac46d4ee12a6b2a51eedf1c310ea880ac2fb13dac5f4461c02f292e079

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