Malicious PDF — malware analysis report

Static analysis result for SHA-256 52cb857a96a64b7b…

MALICIOUS

PDF

37.1 KB Created: 2020-11-05 09:09:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b3aa131a314fa071e2d00d44fe575161 SHA-1: 95f23d3bb4fa55c880a695c0fcb43fca9c86527a SHA-256: 52cb857a96a64b7be051b198b1dbeabb8014fe5dbc272a1fd0ed52a29e2ba842
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link that redirects to a known malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. This link is presented as a lure for a game download, suggesting a phishing or scam attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be the malicious URL.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/aws?keyword=super+drift+3d+2+unblocked In PDF document text
    • https://cdn-cms.f-static.net/uploads/4416321/normal_5fa144d90335f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469128/normal_5fa3586a29ebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393900/normal_5fa2cbbb5584b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411931/normal_5f9c66ce29567.pdfIn PDF document text
    • https://nanorobudilason.weebly.com/uploads/1/3/0/7/130775181/ddd7b0c1a1018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378164/normal_5f8f06bd6afd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419645/normal_5f9d1b9e4c2ed.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/5757701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_5f943573a170e.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/8956929.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/wunojipu/3388370025.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/jaxelejugotiv.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000049cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49CB 5364 bytes
SHA-256: 1d16dec77359ae575010078020e13817ae005a63493a23046d1ab9137d76a112
font_01_sfnt_off00005c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C18 2024 bytes
SHA-256: 5d59e80714f055d0e20d1c4ed594903f00ea25dd365ddc0e243c90ca16be52db
font_02_sfnt_off000065af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65AF 9880 bytes
SHA-256: 519602a0e4a4e4abe49f90bd5d228d8c2a062295d73cee1c85d0ab4328c1aca4

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