Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa594e69bdd5318…

MALICIOUS

PDF

48.9 KB Created: 2020-10-23 20:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 19951f2e30b9db09c221e3972ce66dd1 SHA-1: eac2873ca61c8c46a2b81e09c96730da48f2cd72 SHA-256: 4aa594e69bdd5318b0f85e5b5072b344c66eb2ad5534a12d3a48dc008e8382cf
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or spamming operation. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs are likely used to direct users to malicious sites, potentially for phishing or malware distribution.

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://ttraff.club/123?keyword=android+webview+enable+javascript+alert In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366346/normal_5f8878f3b997d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382405/normal_5f8e6db56d598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5f86f42213348.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/lowat.pdfIn PDF document text
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/zukodod.pdfIn PDF document text
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/9fd55072845169.pdfIn PDF document text
    • https://fadusoga.weebly.com/uploads/1/3/0/7/130739873/zexelixoz_dikeguvuz_kewitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5f888b892f466.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_5f88731d24b25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379852/normal_5f8cbdc381552.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f89c800381a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366964/normal_5f8cc54347a75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365635/normal_5f8d371e16519.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371505/normal_5f9292d684978.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_5f895631c04cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370063/normal_5f8bd3f7a29cd.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/kavitokolezub/13480851292.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/4952/2605/files/jutadezidolosipitepewi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/9241/6946/files/4465114430.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7645/5066/files/gekimuruze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6020/5989/files/gulejogadop.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_off0000748c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x748C 5424 bytes
SHA-256: 921b8b431e10bf717358a1e9a0c9d24c931ca1101f639573a9ce857f848827b5
font_01_sfnt_off00008723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8723 17072 bytes
SHA-256: 5bf0de7edaa09d7eea8b98ba15d54f3c5b4af24f11063d55e93c53d59dce7c10

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