Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8a87c0d514f910…

MALICIOUS

PDF

44.5 KB Created: 2020-10-30 06:43:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1b38862ae78944aca5ab5ceca76f58cf SHA-1: 1830bef634f462e2f310683e75030e112825c74b SHA-256: 3c8a87c0d514f9101bcf61ad08af823b77e9422ac4428c51f281e92d1af84c8f
154 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure at 'https://ttraff.club/123?keyword=vo+lam+truyen+ky+mien+phi+vng'. The ML classifier also strongly flagged this PDF as malicious. The presence of many external links suggests a link farm or phishing attempt designed to lead users to malicious sites.

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=vo+lam+truyen+ky+mien+phi+vng In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376869/normal_5f8c40186ca3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387815/normal_5f95eb79dd208.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405467/normal_5f9743877677a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_5f8d9a3840792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5f8b0d6327ec6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374851/normal_5f9307955cd94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375716/normal_5f89c224bb104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372377/normal_5f8e8487045b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408983/normal_5f93843ea2166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379855/normal_5f94fab2539ab.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/1/0501/8930/3989/files/sentence_structure_worksheet_4th_grade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4532/9832/files/cardinality_of_sets_examples.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9567/8357/files/44015728831.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/merikeleba.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5932 5564 bytes
SHA-256: 084084ec01a35135b09d308bc89881f342567da52f5729842de239f5d26c7658
font_01_sfnt_off00006ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA5 5248 bytes
SHA-256: 1c3b43d3abf34ef1a1e5924ab36cb447ce766a417f727083364b56eedde0117d
font_02_sfnt_off00007e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E6D 11608 bytes
SHA-256: b3d4daff7e2230c9768662c41f0c450180a924e5e91403e87af1694c5722eabf

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