Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80a8e6dc54c3ba1…

MALICIOUS

PDF

35.8 KB Created: 2020-10-09 05:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b0fc837ee78e7a78c0934f6e3807958b SHA-1: 79da843afe034fd8468467b64f827cde6d8d31b6 SHA-256: f80a8e6dc54c3ba13105d86bdccd11f7b44a036672ebdf5b47f373b451d71ff6
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary one identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to lure users to potentially harmful sites. No scripts were extracted, but the embedded URLs are the primary indicators of 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.
  • 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/pify?keyword=work+and+power+lab+how+fast+can+you+do+work+answer+key In PDF document text
    • http://kunogoj.thepaintedacresranch.com/uploads/1/3/2/7/132712435/e3e3e.pdfIn PDF document text
    • http://files.kleboldthreads.us/uploads/1/3/0/7/130776208/rezilizibo.pdfIn PDF document text
    • http://files.cwvmainstreets.org/uploads/1/3/1/0/131070703/6634029.pdfIn PDF document text
    • http://jegewaseb.uptownfaceandbody.com/uploads/1/3/0/9/130969644/wunuga_dapokavime_jiwevumoke_gegozo.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/1/0438/8785/3720/files/76620750522.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0731/9974/files/32427755563.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7625/4873/files/40753533298.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6399/6316/files/xarakab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0465/6790/files/self_care_deficit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7930/2296/files/downton_abbey_daisy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5483/3557/files/wimadij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/1111/6703/files/reconstruction_and_its_effects_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9407/6312/files/70654775222.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_off00004bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BB8 5652 bytes
SHA-256: 9194eb00570f93825fd66fda93f2ae91281cbd4110ff36c662b091f6075b35e3
font_01_sfnt_off00005f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0D 10316 bytes
SHA-256: 0fed6f6dd371826b4b6c0220ceef7e7b776a15e72169ad3377f5b3f8c95b112f

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