Malicious PDF — malware analysis report

Static analysis result for SHA-256 befd6a8754f58dd8…

MALICIOUS

PDF

48.2 KB Created: 2020-10-27 16:40:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: fde69116eda01740d2ed354975823a4d SHA-1: e85423b96e29ddbce0850520ca357126ffcef2fa SHA-256: befd6a8754f58dd88451bdf8a32d69071d8a58aca6850c44bc27123069d64c61
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to these URLs, suggesting an attempt to direct users to potentially harmful content. The ML classifier also strongly indicated maliciousness.

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=revlon+colorsilk+buttercream+brown+black In PDF document text
    • https://cdn-cms.f-static.net/uploads/4392650/normal_5f8ed801e7ec1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5f8860512f16d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411480/normal_5f97c76c47019.pdfIn PDF document text
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/mozes.pdfIn PDF document text
    • https://gemenudotipetal.weebly.com/uploads/1/3/2/6/132695720/fca1b.pdfIn PDF document text
    • https://zuxizakubapepo.weebly.com/uploads/1/3/4/3/134317428/roxewex.pdfIn PDF document text
    • https://fufosasoxesa.weebly.com/uploads/1/3/2/7/132740234/0e2da4f10.pdfIn PDF document text
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/takewi.pdfIn PDF document text
    • https://vekejuritikoj.weebly.com/uploads/1/3/1/8/131857631/5725e.pdfIn PDF document text
    • https://futokiwusilo.weebly.com/uploads/1/3/4/4/134458686/a3c6154.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dazutun/basic_life_support_bls_for_healthcare_providers_instructor_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/27753616290.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/mepapiwitujibezoji.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/relao_entre_sade_e_meio_ambiente.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/sage_accounting_package_tutorial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4179/0871/files/98010167413.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4780/3287/files/beatriz_mariano_okkultist.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0246/8765/files/pool_table_room_size_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4154/5626/files/3543738164.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7481/6674/files/40925802924.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/7717/9294/files/gta_5_free_apk_download_softonic.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2305/5010/files/android_studio_aapt_logs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5469/4039/files/manual_sewing_machine_amazon.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_off00006dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DEC 5188 bytes
SHA-256: 546e2efcd50509b51eef23e17e8648a0395588756bfb50d318b5d845ce8bf86e
font_01_sfnt_off00007f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F8E 11240 bytes
SHA-256: c1c839dcd70b7d76bee742eb1a6e9a2ce07738bcfc635f64757b2e2db79ceb8b
font_02_sfnt_off0000a4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4CA 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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