Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b87888885332eef…

MALICIOUS

PDF

42.1 KB Created: 2020-11-04 23:32:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f11f01ec7d88e7d7a7e54078a8a5f37a SHA-1: d6834677a0a64463acae13316764307d7427a458 SHA-256: 1b87888885332eef10064eb5970158ba9bed61083dee5a83ec8d7341635f5b79
102 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to deliver a malicious payload. The document body also contains the same URL, suggesting it's the primary lure. The ML classifier strongly flagged this PDF as malicious, and the presence of a download button heuristic further supports a malicious intent.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/123?keyword=xfinity+app+download+apk
    • https://cdn-cms.f-static.net/uploads/4416939/normal_5f9e06af7bf2b.pdf
    • https://sewuvemap.weebly.com/uploads/1/3/4/3/134377394/ramopo-menizofir-kigujosizawiri.pdf
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/2ef8772951d488.pdf
    • https://dafalozurevibi.weebly.com/uploads/1/3/4/3/134308304/wudevem-furuliwuva-visosuxuxinusu.pdf
    • https://nobigifawu.weebly.com/uploads/1/3/4/3/134310244/8971366.pdf
    • https://jepupuwupojuv.weebly.com/uploads/1/3/4/4/134481076/25728c43fd24.pdf
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/9534007.pdf
    • https://fabuxitewuf.weebly.com/uploads/1/3/4/3/134349615/gebisududepo.pdf
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/c8b1591a53e55.pdf
    • https://cdn-cms.f-static.net/uploads/4369143/normal_5f9e746a563b7.pdf
    • https://xabopefasuliwik.weebly.com/uploads/1/3/4/4/134445681/ad5a91e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mipeboro/convert_file_into_a_word_document_free.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006864.bin
85037de58fa4d58375da4ca2b0b64cab7cf2a8af319835f1a9e2ed686e953318		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6864 4996 bytes
font_01_sfnt_off0000799b.bin
e29be8b9f626666b4d5fc557baf45401a694df5ae856e843ef79d0f11b89e97a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x799B 10032 bytes

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