Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c4e111ddaba3e9…

MALICIOUS

PDF

44.7 KB Created: 2020-11-06 15:01:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fbc9ec599d878b896a8ef29aaecdaa7a SHA-1: ab0cfcc33903bc413cf30cbe129112b4a6c5e4fa SHA-256: 61c4e111ddaba3e9953221323d41fa26b29f416c4339bb7ccd841dc0de8991b3
184 Risk Score

Malware Insights

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

The PDF contains a large number of links to external websites, many of which are hosted on disposable domains and point to redirectors. The ML classifier strongly indicated maliciousness, and the presence of links like 'https://traffmen.ru/aws?keyword=free+pandora+one+apk' suggests a lure for phishing or malware downloads. No scripts were extracted, but the document's structure and embedded links are indicative of a malicious redirector chain.

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://traffmen.ru/aws?keyword=free+pandora+one+apk In PDF document text
    • https://zipazoraxegav.weebly.com/uploads/1/3/4/3/134325660/84995278b2dc.pdfIn PDF document text
    • https://xijoxamapapi.weebly.com/uploads/1/3/4/3/134337958/wuvafaferexo.pdfIn PDF document text
    • https://melegejisud.weebly.com/uploads/1/3/1/3/131379421/5091743.pdfIn PDF document text
    • https://renefifukidib.weebly.com/uploads/1/3/4/3/134343870/109664.pdfIn PDF document text
    • https://dunofedipusafo.weebly.com/uploads/1/3/4/4/134477286/bipegas_jamilurezese_viwuz.pdfIn PDF document text
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/wofokiziluviv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375352/normal_5f8d5919623b5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/saxefi/87455762598.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31cb29ce-e9a1-4220-99a1-981b0cbe505b/16726378166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78e0c630-9a79-4b13-a730-4883f1b30c73/aqua_ring_pokemon.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_off00006faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FAF 4760 bytes
SHA-256: 41920e8de76996876335900a4c2d13f4dc134fd125c9348c3874770ca3aa714a
font_01_sfnt_off00007ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF1 11672 bytes
SHA-256: 82a06c6a4391e83c85b72109cedcab82c39feb2b99a47aa1bd7b58b11ef4c371

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