Malicious PDF — malware analysis report

Static analysis result for SHA-256 336ea5263ea5f61e…

MALICIOUS

PDF

34.6 KB Created: 2020-07-08 15:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: a23aa261e4c08c61b37a451730228d41 SHA-1: 097d026b8c0006ff66ac240fb177e15e33c20f4c SHA-256: 336ea5263ea5f61e55c3cf6e130c620c5f1a6337814e777431a55b5bc7605c46
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links that point to a redirector URL and a large number of other PDF documents, indicative of a link farm. The ML classifier also flagged this PDF with high confidence. The primary attack pattern involves social engineering, luring the user to click on malicious links disguised as educational content. No scripts were extracted, limiting the analysis of direct payload execution.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.com/wb?keyword=chemistry%20vsepr%20worksheet%20answers In PDF document text
    • http://files.stmarymagdalenewpg.org/uploads/1/3/1/8/131856531/badifa.pdfIn PDF document text
    • http://files.southwickrangers.org/uploads/1/3/1/8/131871762/2fdee0a6f7b3b.pdfIn PDF document text
    • http://files.andrewmichaelart.com/uploads/1/3/1/4/131408529/59fa416c9cccb3.pdfIn PDF document text
    • http://files.printslinkphila.com/uploads/1/3/1/4/131482892/8978254.pdfIn PDF document text
    • http://files.summasportswear.com/uploads/1/3/1/4/131453807/118d8e22a22790b.pdfIn PDF document text
    • http://files.estesparkeventscomplex.com/uploads/1/3/0/7/130739383/witeduget.pdfIn PDF document text
    • http://files.oshkoshcarpetcleaning.com/uploads/1/3/1/0/131070527/didovatifozuba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dutifeja.files.wordpress.com/2020/07/lorek.pdfIn PDF document text
    • https://nugakizapu287319484.files.wordpress.com/2020/07/27915259160.pdfIn PDF document text
    • https://kaladamovala.files.wordpress.com/2020/06/vagewavidufefidukeze.pdfIn PDF document text
    • https://wivutotob.files.wordpress.com/2020/06/winisofobezenesuke.pdfIn PDF document text
    • https://fexaliranofa.files.wordpress.com/2020/07/15153497383.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B92 5156 bytes
SHA-256: 3b0f763d7385ad055bdfa01b3e44c743055ea94f3c54bee3b359d8cf46b403ae
font_01_sfnt_off00005d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D06 9540 bytes
SHA-256: c694927fc17639aa5d81a15891ea3166dedcd63de95ef01d1e5a3dfcd58b8674

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