Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45d3c8bcd194ca9…

MALICIOUS

PDF

45.1 KB Created: 2020-11-05 18:33:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a63548df9ed6b4b9882301348a6be734 SHA-1: dcda0a3c1a7a2175080c5b8c36f6e20a4c11491d SHA-256: b45d3c8bcd194ca9095027fd8c17a93a2cd3f664223987c813c0506c415356b5
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 4

  • 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://ggtraff.ru/123?keyword=volume+of+cone+worksheet+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4421939/normal_5f98ab927c727.pdfIn PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/044dfdd0190b5a1.pdfIn PDF document text
    • https://xumusiroti.weebly.com/uploads/1/3/4/3/134321309/vivofuvugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366637/normal_5f8ff762bce52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417032/normal_5f9cf7138976d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn PDF document text
    • https://uploads.strikinglycdn.com/files/f886db44-f64e-47cb-b33d-b69adc530b3b/30761018299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8c6f9af-673c-4514-8c9e-a01bbbbf55a9/11193802007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ff49399-d29d-4239-85d0-f221f0288c7d/webobo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b533ebdf-f3b8-450e-ac46-1ff3311f1b23/onkyo_tx_sr602_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f5d06a1-1850-4083-ae1d-503b0937c95b/tiraw.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/putapuwagulotafimexij.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/41740047687.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
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E74 5244 bytes
SHA-256: aa284d4db8ba3c6f459b00b0b335b192691215f271555d5417452036fc17a431
font_01_sfnt_off0000703f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x703F 9040 bytes
SHA-256: 14c8f10d1ba98ebaaace6ca8ae429ebeafac034eb8cef6f6957996183a0c5747
font_02_sfnt_off0000824f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x824F 10944 bytes
SHA-256: 805f5d3031e387ec23f717d4cc39d88fab039b4ad463a53803e56b86f86795d9

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