Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff86eda87554d84d…

MALICIOUS

PDF

46.0 KB Created: 2020-10-16 07:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9c2ac7db469d88949a7f0ef081e4791c SHA-1: f5b2a18444dfe467bd4ca88ad0f0236779bd2e62 SHA-256: ff86eda87554d84d574cadd67a041ef57adb40796e04b8afd69414251438d3c6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to external PDF files hosted on disposable domains, indicating a link farm or SEO manipulation scheme. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a potential pathway to malicious content delivery. The ML classifier also strongly flagged this PDF as malicious.

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://gettraff.ru/123?keyword=helicopter+propeller+design+pdf In PDF document text
    • https://liwifaxuje.weebly.com/uploads/1/3/0/8/130874244/7182000.pdfIn PDF document text
    • https://xozanazefozi.weebly.com/uploads/1/3/0/8/130874019/1236395.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/mezevoxinokimuwamibu.pdfIn PDF document text
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/bixonazokisudil_dafapuj.pdfIn PDF document text
    • https://nozagovedenide.weebly.com/uploads/1/3/2/6/132682533/7930590.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368501/normal_5f882bd4e6ec6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373520/normal_5f88bc9ea0e62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366969/normal_5f874a1856c28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5f86f96fdddad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5f8701c8eee62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368251/normal_5f880b18c23d3.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/zuvekazabuz-topofelo-gupolekodojavo-ponabiloxe.pdfIn PDF document text
    • https://xumabilere.weebly.com/uploads/1/3/1/1/131163638/5114492.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/lebof-jekifugivavane.pdfIn PDF document text
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/genakafas.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/gosibokuvefuj.pdfIn PDF document text
    • https://dapujevubo.weebly.com/uploads/1/3/1/4/131438680/5babc5cf9fef701.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/3731638.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/1/0497/9287/6705/files/dulegaxobegamefafodufowo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0957/1990/files/kukobefugibi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6122/1787/files/deadwood_reservoir_in_idaho.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7859/7790/files/youtube_video_download_android_online.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_off000075fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75FD 5076 bytes
SHA-256: 5d244436f1566a707a8a46b110a50eb230916ecd2e4d65706f33438539bff780
font_01_sfnt_off0000874a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x874A 10396 bytes
SHA-256: 372aec048445f81c6068f0f07423345c4f3018d4d98d985bf174b07863aed161