Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d941f7c9e798b3e…

MALICIOUS

PDF

69.9 KB Created: 2020-12-25 06:07:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: fca20d7ebb73ea8a5ab8f39cddfd3feb SHA-1: ee93066bcedfe717f99fc8813903404cfacd49e9 SHA-256: 3d941f7c9e798b3ee362f81baf375338b45c7b121505cd43ab72763ee4ff8325
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm for SEO manipulation or to distribute further malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/aws?utm_term=blank+picture+frame+template In PDF document text
    • https://jibabarudemafe.weebly.com/uploads/1/3/4/7/134748102/8087476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467287/normal_5fd6404aae7e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371495/normal_5f8abfe83d0be.pdfIn PDF document text
    • https://nedonesirewas.weebly.com/uploads/1/3/4/4/134482228/29fcd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387230/normal_5fcd26c28938e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450251/normal_5fc2163547423.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492897/normal_5fb5d7c7f192b.pdfIn PDF document text
    • https://cdn.sqhk.co/fijajiles/fihaggq/japan_drag_racing_2d_apk_mod.pdfIn PDF document text
    • https://junafoxotoroj.weebly.com/uploads/1/3/0/7/130738975/6db6af2.pdfIn PDF document text
    • https://sajaxelofokaxus.weebly.com/uploads/1/3/0/7/130776185/kuzegavuvizoli.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/4e0ab880-4448-4a7a-8448-7fcd36e228f7/miss_honey_from_matilda.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/90565999073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61499aea-48df-47e2-bb1d-03062648aa76/pufiliwiwixulopakixomoz.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_off0000d618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD618 5096 bytes
SHA-256: dce998844a81299f654cdb16a513c54c130ed7d3530d5d9537941bb73f715a7d
font_01_sfnt_off0000e75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75D 10568 bytes
SHA-256: 04ae0d2345ed3d1d6ba91469e041ee810f8b4dc01c21103479d5ffcc12c72ce2

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