Malicious PDF — malware analysis report

Static analysis result for SHA-256 466d85a24eb5f6ee…

MALICIOUS

PDF

42.8 KB Created: 2020-10-26 04:47:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5567d80663ac957fcb36f771a4fcabd9 SHA-1: 9d5db43f9de52a967c9593b78919841e95585749 SHA-256: 466d85a24eb5f6eef60d4afc1a9bb0ab0762f2a85a0d79a90d8343e690db1c39
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it's a redirector link to malicious infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for an academic book, likely to trick users into clicking the malicious link. No scripts were extracted, but the presence of many links and the ML classifier's high confidence suggest a malicious intent to redirect users to harmful content.

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.
  • 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.
  • 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/strik?keyword=norton+anthology+american+literature+9th+edition+ebook In PDF document text
    • https://buxiniti.weebly.com/uploads/1/3/4/3/134309366/3426258.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/29ecf51e66f79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_5f8952cb809f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378621/normal_5f8f1e6ea6405.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384819/normal_5f91e5ff4cccc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387406/normal_5f908e9962b36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f8722dc4ab10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384149/normal_5f8f629b84982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367952/normal_5f8822cfc7d47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368505/normal_5f95f90639701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f88d5cb32f30.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/b315d632-4b47-4e85-9d40-a7184d0d0d87/tijaselig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f319682c-8a27-423a-921e-788e444292d9/80731829057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ed4458e-6b58-4365-b00c-835389a3bc82/68287784134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dfff1bb-f048-4a12-93d6-dd07266109c5/rebadifazotepadinodiwi.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/94302396738.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/5057/4239/files/70890409366.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7333/0586/files/87365762742.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1042/3487/files/4399904998.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5834/8703/files/kevamipepiziwuratifixifor.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_off00006557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6557 5608 bytes
SHA-256: 180d5732255c116f6d5aa07e77eb5fd152ac6d2588c82c827a5f903e810083bf
font_01_sfnt_off0000783b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x783B 11356 bytes
SHA-256: f75a7674739217fe63b3053f23d7614efeb502e3a2c151c2d3f26bb9338ffff3

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