Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6728f7b7ee4b7f5…

MALICIOUS

PDF

39.6 KB Created: 2020-11-01 22:09:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 13fee198b62e7e48c1971db96b7f18cc SHA-1: 3af4bb8293edb560fdb1f3d498ea131edb241c3b SHA-256: f6728f7b7ee4b7f5c2829dbc0b78eae76d82a667b4763859258c627572cbb737
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with the primary link pointing to a known malicious redirector. This suggests the document is designed to drive traffic to malicious sites, potentially for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=lightroom+classic+torrent+reddit In PDF document text
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/1732614.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416660/normal_5f99f1c0c9115.pdfIn PDF document text
    • https://domuzowejiro.weebly.com/uploads/1/3/4/3/134360268/7936657.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5f9416dde948b.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
    • https://uploads.strikinglycdn.com/files/d3a2a014-f14e-4a79-b0f0-499615305799/96134482031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6e07698-8c7a-44a2-9adc-21a8d72b61fa/new_england_outdoor_voice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b1a00b0-8516-4f69-bd8e-c7af729764e3/atheist_books_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a23ea448-fefd-4733-93d1-a9467f41ee1b/41234439026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3796cae9-2f33-45fd-a771-0dc6d7fe545e/3011174482.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_off0000502f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x502F 5080 bytes
SHA-256: 8fa7162f02ce1ce103c2953caaa4c9f7f0b1214e07d2affa3806b9d93d9f62bf
font_01_sfnt_off00006146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6146 10116 bytes
SHA-256: bcb02742ed914ec023212722da414d45deaf3ca700c5b482d0606cd2aff9dcf7
font_02_sfnt_off000083d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83D1 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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