Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dd4d218a2699aa8…

MALICIOUS

PDF

51.0 KB Created: 2020-11-04 23:44:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a1104885e63ab145db476ad4e317ea3f SHA-1: 1d39abfec33ff06e79e919cf4da1b1681e1fa6ad SHA-256: 1dd4d218a2699aa86fd9b773b53c0646a42fb1c5165d9ca0097626a6f296f48a
162 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. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/strik?keyword=asphalt+8+hack+apple+tv In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417414/normal_5fa24aa1adf88.pdfIn PDF document text
    • https://jozisilefetaj.weebly.com/uploads/1/3/4/4/134476246/8387361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_5fa2af681461b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374542/normal_5f91dfe5d597e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387419/normal_5f8e5758a8648.pdfIn PDF document text
    • https://junoxavod.weebly.com/uploads/1/3/1/3/131384771/mawojisebawoxonebu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390068/normal_5f98c2f48a9ca.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/730fe3f5-3146-4bb0-97ed-cf469bc5bc1f/betusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40945fc4-d687-4191-a00c-8599ecd4f6cf/hutchinson_clinical_methods_23_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fbf5592-a259-4137-9a9e-7a7ddc1b2b94/81591393282.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/pepejiruwax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a119b8a5-c967-4887-b52a-405a62ccc196/teresa_moore_ca.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA7 5232 bytes
SHA-256: 63bb995102c2802ef6083911ce3aa6de2748482dec875468b85bf933b0c5540e
font_01_sfnt_off00008c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C73 3508 bytes
SHA-256: c9c1075aa37ac8d476268b24e51156a047bddecdbda7b766632e612e80b26d9e
font_02_sfnt_off00009a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A3E 10860 bytes
SHA-256: 3523cf5b70d9011397720f93eced89e2adf73071a1eba1c655b95a27e5463f41

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