Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea8b90ae4bac076…

MALICIOUS

PDF

49.7 KB Created: 2020-10-31 22:16:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: db3674a7b23a3e84de7d53942faee28b SHA-1: 8cec4a4fb16c1522248dcb443a418b6de04f0719 SHA-256: aea8b90ae4bac076e570107f32f6591e5fb348581ff6279ff0548900396cd220
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document is flagged as malicious by an ML classifier and contains numerous links to external resources, including a known malicious redirector. The document body itself is heavily obfuscated but contains a URL that appears to be part of a link farm or SEO manipulation scheme. The presence of multiple links to external PDFs suggests an attempt to distribute or host malicious content, or to manipulate search engine results.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ttraff.link/123?keyword=derech+eretz+kadma+l%2527torah+source In PDF document text
    • https://sosegesidor.weebly.com/uploads/1/3/4/4/134465043/jafuwikemulaxetifumu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369660/normal_5f9b937dce9b2.pdfIn PDF document text
    • https://kivuligob.weebly.com/uploads/1/3/0/8/130874143/d7426a0f0c6072e.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/kisisekomore_povogulojowoj_korijaxexuke_tewoweloziru.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/gijem_xufanonun_pomipafuvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372072/normal_5f8a81508b516.pdfIn PDF document text
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/1607846.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384480/normal_5f8db1790bc23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403533/normal_5f9495e2c5c4f.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/8279037.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/4694/1084/files/cracked_vpn_apk_reddit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5706/9721/files/bazadifexonitananexipin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6537f8ff-5616-48d1-883f-67e1bb763db1/93211994707.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7967/9656/files/taylormade_sldr_hybrid_adjustment_chart.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A18 5324 bytes
SHA-256: 221e45677a33d898fdd7dbefa5f555b26bc0354ad97876925fca6f1e6527f0a4
font_01_sfnt_off00008c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C1C 15040 bytes
SHA-256: 9fc7972c1f50613cd0175683c677b45502b7c990d13c243d09a649f7d0d2b4e2

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