Malicious PDF — malware analysis report

Static analysis result for SHA-256 f204c7c9b89b2b5e…

MALICIOUS

PDF

40.0 KB Created: 2020-10-30 04:45:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7f747118fec608903d8ec4fe64edf5e2 SHA-1: 934a83aaaaa28408b6118a766fdf0ecf606b3ec9 SHA-256: f204c7c9b89b2b5ea5fea839a383cd5b9adc05ad04fe41129b254fdbddb6da4e
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to external PDF files, suggesting a link farm or redirection scheme. One of the primary URLs, 'https://ggtraff.ru/123?keyword=pearson+ap+environmental+science+textbook+pdf', is flagged as a known malicious redirector. The presence of numerous external links and the malicious redirector indicates an attempt to lead users to potentially harmful content, likely as part of a phishing or malware distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/123?keyword=pearson+ap+environmental+science+textbook+pdf In PDF document text
    • https://sizukejagu.weebly.com/uploads/1/3/2/6/132681884/8902364.pdfIn PDF document text
    • https://jemiwuwavaza.weebly.com/uploads/1/3/0/8/130814288/tigosorivibisakoxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384316/normal_5f981ec067944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382613/normal_5f96209fe1458.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379471/normal_5f9b660b1d396.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/1/0502/2973/9704/files/cmd_tricks_and_hacks_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1229/5325/files/15713291024.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8462/0991/files/dungeons_and_dragons_handbook_5th_edition.pdfIn macro / runtime command snippet
    • https://cdn.shopify.com/s/files/1/0488/9716/3423/files/dewalt_battery_charger_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2574/3521/files/philippine_politics_and_governance_lm.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9181/2767/files/dupoxujekowimifujujo.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
    • https://cdn.shopify.com/s/In macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B51 5632 bytes
SHA-256: d6a79e8ce9861bdaf0200e62669f5d2f9c32536298b7c513d47319f1e43d1b12
font_01_sfnt_off00006e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E6F 10800 bytes
SHA-256: 48be8ac182783a18e630c2ac4a8d40eb690729ac0b4ca5cce5f6a87a4d9ac8cb

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