Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6b212f2f64eb11…

MALICIOUS

PDF

33.6 KB Created: 2020-09-18 08:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cafb305ed01ee4763590d900d4f2d8e SHA-1: cc15c2f39b31a9b559fac7cf1e3ce242336019cb SHA-256: eb6b212f2f64eb117e02bcd17dfafc5fb2b5e3698375464fbf3a14d0a24d4a90
152 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by a machine learning classifier and contains numerous embedded links. The primary attack pattern involves a link farm that redirects to potentially malicious content, as indicated by the critical heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though partially corrupted, contains text related to educational worksheets, likely a lure to disguise the malicious links. The presence of multiple PDF links hosted on various domains suggests an attempt to game search engine results or distribute malware through a link farm.

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.link/wix?keyword=dividing+polynomials+long+and+synthetic+division+worksheet
    • http://files.bellaviratownhomes.com/uploads/1/3/0/8/130874567/3347878.pdf
    • http://tiwefuto.oa-southernalberta.com/uploads/1/3/1/8/131856643/fojipivep.pdf
    • http://files.sunrisehomeownersassociation.org/uploads/1/3/1/6/131607093/wusixokuwewafupu.pdf
    • http://files.montessoricowichan.com/uploads/1/3/1/4/131453436/lazuz.pdf
    • http://xipabi.clydemarconstruction.com/uploads/1/3/0/9/130968984/8a986e887.pdf
    • http://files.holyfamilystowathletics.com/uploads/1/3/0/9/130969699/vojawawimalajoxomeko.pdf
    • http://gusidisuz.hatcherforgeandleather.com/uploads/1/3/2/3/132302978/d5642b8dbed4.pdf
    • http://files.yourwshop.com/uploads/1/3/1/6/131636655/6597647.pdf
    • http://files.thinkgrafix.net/uploads/1/3/1/3/131379591/zoxexijo_wabixitasew_nobiwarijitoj.pdf
    • http://files.hstmasia.org/uploads/1/3/1/8/131857115/fapusoxibezeteduso.pdf
    • http://files.ocmulgeeblacksmithsguild.org/uploads/1/3/0/7/130776220/9761914.pdf
    • http://files.kindactswarmhearts.com/uploads/1/3/0/8/130813100/fizakufulu.pdf
    • https://8eca61bb-2817-4fdb-9296-e65f3909aeed.filesusr.com/ugd/97aff7_292924bde6424578836199df0384aa51.pdf?index=true
    • https://48e7fbe4-92ec-4712-8770-953ddb5202bc.filesusr.com/ugd/904a8b_52ed4709562041f6847eb3a244c2d412.pdf?index=true
    • https://c8a9072f-3693-42f1-bff0-49c14006a75e.filesusr.com/ugd/e1d12c_1c347b2201f54b79a1777824bece062a.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000045eb.bin
c06389194b18f8654aba5748cedfc47dc937602377b9d55c7347d3639a09da4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45EB 5804 bytes
font_01_sfnt_off000059a6.bin
76802e4834ee6e5acd3e3627651cc247e5a2de0c78d50d2e7589de5bb9cef709		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59A6 9300 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.