Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1c058b73904a26…

MALICIOUS

PDF

73.5 KB Created: 2020-11-04 07:49:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4e195d2de119bf8a5a37a8c30e41acf7 SHA-1: 11bb768a4f0d221b12a2ee7dfd17b39368a0b035 SHA-256: 1b1c058b73904a26853be0e7c8e0c2bdd0fa4309a5a54d46c1a9427a6eb90e4e
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://gettraff.ru/strik?keyword=the+complete+persepolis+marjane+satrapi+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403259/normal_5f9eb340f3754.pdfIn PDF document text
    • https://zonisobeb.weebly.com/uploads/1/3/4/3/134333784/5f737cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392871/normal_5f9052c297b9f.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/34612d8315b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5f95c9bf5d45b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421354/normal_5fa0c6d29bb7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401716/normal_5f9cf5862918b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368751/normal_5f8813c088c05.pdfIn PDF document text
    • https://wenadexedodoren.weebly.com/uploads/1/3/4/3/134322255/nowagadivon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1692750-a5a6-49c3-a219-94ee8f4e257a/bawuwinibisidobezedive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51c7c4fd-a41d-41c3-b2d8-8eedc4139421/32138603887.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/jamila_chingiz_aitmatov.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC8 5420 bytes
SHA-256: e98b000315ea06e3871c70edf24443a02447889de337bb5dd4d4a252a84187d0
font_01_sfnt_off0000dd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0B 11320 bytes
SHA-256: 0cd7f575d41ca6cd88e8ada221fd302d3c4269fc39e2db7f417a673bc4af585f
font_02_sfnt_off000103bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BB 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953

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