Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa3805210280941…

MALICIOUS

PDF

39.7 KB Created: 2020-11-04 20:03:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dac14b1cd8d86df078806912ce499b56 SHA-1: 1282a0d4990d2d39877edd4ac2646b22a46c6a9d SHA-256: faa3805210280941b366d4a08c3961c873e7731b465622983f1cc1f03de58a44
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/strik?keyword=calendar+template+2019+2020+printable+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4401540/normal_5f95c997d3f38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367921/normal_5f909f77bfa38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383797/normal_5f980c8f190a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5f8d0bb43cc50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368228/normal_5f9a1506c9abe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377414/normal_5f9a091f2f25f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368248/normal_5f87857618086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411480/normal_5f9840de690d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_5f87418c156fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390056/normal_5fa28d7053420.pdfIn PDF document text
    • https://repafajekojila.weebly.com/uploads/1/3/4/3/134305679/16b4f.pdfIn PDF document text
    • https://gemegomuzek.weebly.com/uploads/1/3/4/3/134339500/senedovixajalik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381759/normal_5f9082267351f.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
    • 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.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000044f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44F5 5332 bytes
SHA-256: b36bea233cc569d81a6833d54bf982be200f2f47eb755bbd40b0a0f459c30135
font_01_sfnt_off000056f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56F2 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off00006254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6254 9700 bytes
SHA-256: 805ad91c9bb63fe8f4aa983797ee908bb9e6f074ad71691175ca8bad11ea1103
font_03_sfnt_off0000837c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x837C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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